The 12 Hallmarks of Aging → What Targets Them
A physician-built map of the 12 hallmarks of aging (López-Otín 9 + 3) — what each one means, the labs that track it, and the proven vs experimental interventions that target it.
Built and medically reviewed by Charles Kamen, MD, board-certified neurologist ·
The hallmarks of aging are the biological processes that together cause aging — the cellular and molecular damage that accumulates over a lifetime. First defined as nine hallmarks in a landmark 2013 paper, the framework was expanded to 12 in 2023, when disabled macroautophagy, chronic inflammation (inflammaging), and dysbiosis were added. The hallmarks give longevity medicine its conceptual map: they explain why we age and point to where interventions might act.
One honest thread runs through the whole map: the interventions with the strongest human evidence for aging are lifestyle-based. Regular exercise (aerobic and resistance), adequate sleep, a nutrient-dense diet, and a healthy weight act across nearly every hallmark — nutrient-sensing, mitochondrial function, inflammation, even cellular senescence. The pharmacological interventions that target individual hallmarks — rapamycin, metformin, NAD+ precursors, senolytics — are mostly experimental, and we grade them honestly on our longevity drug evidence index. A molecule whose biology intersects a hallmark is not the same as a proven treatment for aging.
This page pairs with two other physician-built references: the drug/supplement evidence grades (what the molecules are graded for human evidence) and the peptide evidence grades. Together they let you ask three separate questions cleanly: what drives aging (this page), how well-studied a molecule is (the drug index), and what a given molecule actually is (our classifier).
The three families of hallmarks
Primary damage hallmarks. The root causes — DNA damage, telomere shortening, epigenetic changes, protein and autophagy failure.
Antagonistic response hallmarks. The body’s responses to damage — nutrient-sensing shifts, mitochondrial decline, and cellular senescence — protective at first, harmful over time.
Integrative failure hallmarks. The system-level consequences — inflammation, stem-cell exhaustion, communication breakdown, and gut dysbiosis.
The map: 12 hallmarks → labs and levers
Each hallmark mapped to what it means, the labs or biomarkers that track it, and the proven (lifestyle) vs experimental (pharmacological) interventions that target it.
| Hallmark | What it means | Labs / biomarkers to watch | Proven levers | Experimental levers |
|---|---|---|---|---|
| Genomic instabilityPrimary damage · original 2013 | Accumulating damage to DNA — from replication errors, oxidative stress, and environmental insult — slowly undermines cellular function. | No routine clinical marker. DNA-damage assays (e.g., γ-H2AX) are research tools. | Avoiding smoking and excess alcohol; minimizing sun/UV and radiation exposure. | No proven pharmacological DNA-repair intervention in humans. |
| Telomere attritionPrimary damage · original 2013 | The protective caps on chromosome ends shorten with each cell division until cells stop dividing. | Telomere length (available via commercial tests); see our telomere-length guide. | Exercise, healthy weight, not smoking, and stress management are associated with slower shortening. | No FDA-approved telomere-lengthening therapy; some compounds are marketed without human outcome evidence. |
| Epigenetic alterationsPrimary damage · original 2013 | Changes in how genes are switched on and off over time — the basis of "biological age" clocks. | Epigenetic clocks — PhenoAge, GrimAge, DunedinPACE — estimate biological age from DNA methylation (see our biological-age test comparison). | Lifestyle change (diet, exercise, weight loss) is associated with measurable epigenetic-age shifts. | No approved therapy to reverse epigenetic age; it remains an active research frontier. |
| Loss of proteostasisPrimary damage · original 2013 | Cells lose the ability to fold proteins correctly and clear damaged ones, leading to toxic buildup. | No routine marker; implicated in neurodegenerative disease. | Exercise and intermittent fasting both upregulate the cell’s protein-recycling machinery. | Heat-shock and proteostasis-targeting compounds are preclinical to early-stage. |
| Disabled macroautophagyPrimary damage · added 2023 | Added in 2023. The cell’s recycling system (autophagy) slows, so damaged components accumulate. | No routine clinical marker; measured in research settings. | Exercise, fasting, and time-restricted eating are the best-evidenced ways to stimulate autophagy. | Spermidine and rapamycin both modulate autophagy in models — see our drug evidence index. |
| Deregulated nutrient-sensingAntagonistic response · original 2013 | The pathways that sense food (insulin, mTOR, AMPK, sirtuins) become dysregulated, impairing how cells manage growth and repair. | Fasting insulin, HbA1c, glucose, IGF-1 — see our longevity biomarker ranges. | Exercise, caloric balance, and minimizing processed food keep these pathways responsive. | Rapamycin (mTOR) and metformin (AMPK) intersect this hallmark — both experimental for aging. |
| Mitochondrial dysfunctionAntagonistic response · original 2013 | Mitochondria — the cell’s energy plants — decline in number and efficiency, sapping energy output. | VO2 max (cardiorespiratory fitness), lactate; NAD+ levels are a research proxy. | Aerobic exercise ("zone 2") is the strongest evidence-based lever for mitochondrial health. | NAD+ precursors (NMN, NR) and urolithin A (mitophagy) target mitochondria — Tier C. |
| Cellular senescenceAntagonistic response · original 2013 | Damaged cells stop dividing but refuse to die, secreting inflammatory signals that harm neighbors ("zombie cells"). | No routine clinical marker; p16/SASP markers are research tools. | Exercise and healthy body composition are associated with lower senescent-cell burden. | Senolytics (dasatinib + quercetin, fisetin) aim to clear these cells — early human data, Tier C. |
| Chronic inflammation ("inflammaging")Integrative failure · added 2023 | Added in 2023. A persistent, low-grade inflammatory state that develops with age and drives many diseases. | hs-CRP, IL-6 — core markers on our longevity biomarker ranges page. | Diet, exercise, sleep, weight, and gut health are the strongest modifiable levers. | No approved anti-aging anti-inflammatory regimen; lifestyle remains the evidence backbone. |
| Stem cell exhaustionIntegrative failure · original 2013 | Tissues lose the regenerative stem cells that replace damaged cells, slowing repair across the body. | Routine blood counts (CBC); tissue-specific stem assays are research only. | Exercise supports regenerative capacity; avoiding metabolic disease protects stem-cell pools. | Stem-cell and regenerative therapies are investigational for aging; not FDA-approved for it. |
| Altered intercellular communicationIntegrative failure · original 2013 | Cells communicate poorly — inflammatory, hormonal, and nervous-system signaling all become noisier and less coordinated. | Hormone panels (testosterone, estradiol, thyroid); overlaps with inflammation markers. | Exercise, sleep, and social connection support healthier signaling networks. | Hormone optimization is condition-specific medical care, not a general anti-aging strategy. |
| DysbiosisIntegrative failure · added 2023 | Added in 2023. The gut microbiome shifts with age in ways that influence immunity, metabolism, and inflammation. | Commercial stool/microbiome testing (still maturing clinically). | Diverse, fiber-rich diet; regular exercise; limiting unnecessary antibiotics. | Targeted probiotics and postbiotics (e.g., urolithin A production) are an active research area. |
How to read this map:“proven levers” reflects the strongest completed human evidence for an aging-relevant outcome — which is usually lifestyle. “Experimental levers” reflects molecular biology that intersects the hallmark and is under active study; it is not a claim that the molecule treats aging in humans. For honest evidence tiers on the molecules, see our longevity drug evidence index. For the labs referenced here, see our longevity biomarker ranges.
Scope & compliance: this is an educational map of a scientific framework, not medical advice. It contains no doses, no protocols, and no treatment claims. Many referenced interventions are experimental or off-label. Decisions about any medication, supplement, or lifestyle change should be made with a licensed physician who can evaluate your individual situation.
How a physician uses the hallmarks
The hallmarks are a map, not a checklist. In practice, a physician uses them to organize your labs and history into a coherent picture: where is your inflammation (inflammaging)? How well is your metabolism regulated (nutrient-sensing)? What is your mitochondrial and hormonal fitness telling you? From there, the highest-evidence levers almost always come first — sleep, exercise, nutrition, and weight — because they act across multiple hallmarks and have the strongest human data behind them.
Experimental options enter the conversation only when the foundation is in place and when their human evidence fits your situation — and always with an honest read on the tier. We do not sell a cart of “hallmark-targeting stacks.” Care starts with an $88 evaluation built around your actual labs and goals. For the full service overview, see physician-led longevity medicine.
The hallmarks in Las Vegas
The biology does not change by ZIP code — but the marketing does. Las Vegas is dense with concierge “longevity” programs that lead with experimental molecules and supplements, often before the basics (sleep, exercise, metabolic health) are in place. The hallmarks framework cuts through that: it shows why the unglamorous foundations act on the most hallmarks at once, and keeps experimental options in their honest, evidence-graded place.
Whether you visit our southeast Las Vegas clinic at Eastern Avenue and the 215 from Henderson, Summerlin, or Green Valley — or meet Dr. Kamen by secure telehealth anywhere in Nevada — the conversation is the same: a map of your biology, the evidence behind each lever, and a plan built around your goals. Visit our Las Vegas clinic to start.
Selected Research
- López-Otín C, Blasco MA, Partridge L, Serrano M, Kroemer G. The hallmarks of aging. Cell. 2013;153(6):1194-1217.
- López-Otín C, Blasco MA, Partridge L, Serrano M, Kroemer G, Kroemer G. Hallmarks of aging: An expanding universe. Cell. 2023;186(2):243-278.
- Mannick JB, et al. TORC1 inhibition enhances immune function and reduces infections in the elderly. Sci Transl Med. 2018;10(449):eaaq1564.
- Verdin E. NAD+ in aging, metabolism, and neurodegeneration. Science. 2015;350(6265):1208-1213.
Anchors for the hallmark framework (López-Otín 2013/2023) and nutrient-sensing / mitochondrial context only. Framework reference, not a treatment claim. Nothing here is medical advice.
Hallmarks of Aging FAQ
What are the hallmarks of aging?
The hallmarks of aging are the fundamental biological processes that together drive aging — the cellular and molecular changes that accumulate over time and underlie age-related decline. They were first defined in a landmark 2013 Cell paper (López-Otín et al.), which proposed nine hallmarks, and expanded in 2023 to twelve. The hallmarks give researchers and clinicians a shared map of why we age and where interventions might act.
How many hallmarks of aging are there?
There are twelve hallmarks of aging as of the 2023 update (López-Otín et al., "Hallmarks of aging: An expanding universe"). Nine were defined in the original 2013 paper — genomic instability, telomere attrition, epigenetic alterations, loss of proteostasis, deregulated nutrient-sensing, mitochondrial dysfunction, cellular senescence, stem cell exhaustion, and altered intercellular communication. The 2023 update added three more: disabled macroautophagy, chronic inflammation (inflammaging), and dysbiosis.
Which hallmark of aging can I actually target?
All of them respond, to some degree, to lifestyle — and the interventions with the strongest human evidence for aging are lifestyle-based. Regular exercise (aerobic and resistance), adequate sleep, a nutrient-dense diet, and maintaining a healthy weight are the best-evidenced levers across nearly every hallmark: they improve nutrient-sensing, mitochondrial function, inflammation, and more. Pharmacological and supplement interventions mostly remain experimental and are graded on our longevity drug evidence index.
What labs track the hallmarks of aging?
Some hallmarks have routine clinical markers; many do not. The most trackable through standard labs include deregulated nutrient-sensing (fasting insulin, HbA1c, glucose, IGF-1), chronic inflammation (hs-CRP, IL-6), and altered communication (hormone panels). Epigenetic and telomere changes are measured by commercial biological-age tests rather than routine labs. See our physician-curated longevity biomarker ranges for the targets that matter and what they mean.
Do rapamycin, metformin, and NAD+ target the hallmarks of aging?
Their biology intersects specific hallmarks, but they remain experimental for aging itself. Rapamycin targets deregulated nutrient-sensing (mTOR) and has the strongest completed human healthspan data of any longevity molecule (Tier B on our drug index). Metformin also intersects nutrient-sensing (AMPK) but is Tier C for aging. NAD+ precursors (NMN, NR) target mitochondrial function and are Tier C. "Intersects a hallmark" is not the same as "proven to treat aging in humans" — see the drug evidence index for honest grades.
What is inflammaging?
Inflammaging is the chronic, low-grade inflammation that develops with age and was named a hallmark of aging in the 2023 update. Unlike acute inflammation (which fights infection and heals injury), inflammaging is persistent and smoldering, and it drives many age-related diseases — cardiovascular disease, diabetes, neurodegeneration, and more. It is measured with markers like hs-CRP and IL-6, and the strongest modifiable levers are diet, exercise, sleep, weight, and gut health.
Is there a blood test for biological age?
There is no single accepted "biological age blood test," but epigenetic clocks estimate biological age from DNA-methylation patterns. The best-validated include PhenoAge (built from blood chemistry), GrimAge (a predictor of mortality and age), and DunedinPACE (a pace-of-aging measure). These are commercial tests, not routine labs, and their clinical use is still maturing — but they are the closest thing to a measurable "how fast are you aging" signal today.
Is the hallmarks framework relevant in Las Vegas or Nevada?
The biology does not change by ZIP code, but the conversation does. Whether you visit our southeast Las Vegas clinic at Eastern Avenue and the 215 from Henderson, Summerlin, or Green Valley — or meet Dr. Kamen by secure telehealth anywhere in Nevada — the framework is the same: we look at which hallmarks your labs and history point to, which have the strongest evidence for intervention (usually lifestyle first), and which experimental options might fit your goals. It is a map for a plan, not a stack of supplements.
Related reading: Longevity Drug Evidence-Grade Index · Senolytics evidence grades · Biological age tests compared · Peptide Evidence-Grade Index · Longevity biomarker ranges · Is it a peptide?
Physician-Led in Las Vegas
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