What is the Longevity Research Library?

The Longevity USA Research Library curates recent peer-reviewed studies on longevity, nutrition, exercise, sleep, and supplements. Each study is rated by evidence strength: Strong, Moderate, or Preliminary.

How are evidence levels determined?

Evidence levels are based on study type (meta-analysis, RCT, cohort study), sample size, journal impact factor, and reproducibility of findings.

59 studies

Research Library

Peer-reviewed papers from top journals, summarized and graded by evidence strength. Updated Mon, Wed & Fri.

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Apr 12–18, 2026

Tracking Your 'Biological Age' Over Time May Predict Death Risk Better Than a Single Snapshot

In over 90,000 Dutch adults followed for nearly 14 years, people whose biological age ran ahead of their calendar age had a higher risk of dying. More importantly, among 25,000 people measured twice, those whose biological age sped up over time faced even greater risk. People stuck in a pattern of accelerated aging had a 39% higher mortality risk compared to those aging at a normal pace. The results suggest that checking biological age once might not be enough.

GeroScience·Moderate·Apr 13, 2026

Apr 5–11, 2026

We May Not Be Aging Slower. We're Just Starting Later.

A big question in longevity research is whether rising life expectancy means we're actually aging more slowly. This analysis of mortality data from 12 countries suggests the answer is no. After accounting for historical shocks like wars and pandemics, the rate at which aging accelerates after 80 hasn't changed. The gains in lifespan appear to come from pushing back when serious aging begins, not from slowing the process itself.

Proceedings of the National Academy of Sciences of the United States of America·Moderate·Apr 8, 2026

Frailty Doubles Death Risk in People With Heart and Metabolic Disease

Looking at five large studies across the US, UK, and China, people with heart or metabolic conditions who were frail had up to 132% higher risk of dying from any cause. Even being slightly weak (pre-frail) raised the risk by 21% to 66%. The link was strongest in people under 65 and those with lower body weight.

iScience·Strong·Apr 7, 2026

Mar 22–28, 2026

Centenarians Show a Distinct Metabolic Profile Tied to Bile Acids and NAD+

People who live past 100 have a unique metabolic fingerprint. In a study of 213 participants from the New England Centenarian Study, extremely long-lived individuals had higher levels of certain bile acids and lower levels of bilirubin compared to younger controls. Higher bile acid and steroid levels were linked to lower mortality risk. The researchers also built a "metabolomic clock" that estimates biological age, and deviations from it predicted death risk.

GeroScience·Moderate·Mar 26, 2026

Mar 15–21, 2026

Frailty Triples Death Risk, and Exercise Alone May Not Fix It

Frail adults in South Korea had over three times the mortality risk compared to robust individuals over a 16-year follow-up. Pre-frail people also had about 70% higher risk. Meeting standard exercise guidelines (150 minutes per week) didn't independently lower death risk in pre-frail or frail individuals after accounting for other factors. Frail participants who met those guidelines actually had higher healthcare costs, suggesting generic exercise advice may not suit everyone.

The Journal of frailty & aging·Moderate·Mar 18, 2026

Mar 8–14, 2026

Frailty Markers Predict 20-Year Death Risk in Older Chinese Adults

In about 4,000 older Hong Kong adults tracked for nearly two decades, frailty measures strongly predicted who would die and from what cause. Being frail was linked to a 66% higher risk of death compared to being fit. Adding blood-based markers like inflammation and kidney function to frailty scores slightly improved predictions. One surprise: none of the biological aging markers predicted cancer deaths specifically.

The journals of gerontology. Series A, Biological sciences and medical sciences·Strong·Mar 12, 2026

Disclaimer: Research summaries are provided for informational purposes only and do not constitute medical advice. Always consult a qualified healthcare professional before making changes to your health routine.

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