Genetics Play Bigger Role in Longevity Than Previously Thought

New study reveals genetics account for over 50% of lifespan, challenging earlier estimates

Apr. 12, 2026 at 2:35pm

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An abstract painting in the style of Hilma af Klint, featuring sweeping geometric shapes, concentric circles, and organic spirals in muted tones, representing the complex forces that influence human lifespan.A conceptual illustration depicting the intricate interplay between genetics and environment in determining human longevity.Lincoln Today

A groundbreaking study published in the journal Science suggests that genetics plays a more substantial role in determining human lifespan than previously believed. The research indicates that when excluding deaths caused by external factors, the heritability of human lifespan due to intrinsic mortality exceeds 50 percent - more than double previous estimates.

Why it matters

Understanding the genetic contribution to longevity is a key element of aging research, as it could lead to new insights and interventions to promote healthy longevity. This study challenges long-held assumptions about the relative influence of genes versus environment on lifespan, providing a more nuanced view of the complex factors that shape how long we live.

The details

The team of researchers from Israel's Weizmann Institute of Science and Sweden's Karolinska Institutet employed mathematical modeling and analyzed twin cohorts to correct for the masking effect of external mortality factors. Their findings reveal that the heritability of human lifespan due to intrinsic mortality is now estimated to be around 55 percent - a figure more than double previous estimates of 15-33 percent.

  • The study was published in the journal Science on April 12, 2026.

The players

Weizmann Institute of Science

A leading research university in Israel that conducted part of the longevity study.

Karolinska Institutet

A prestigious medical university in Sweden that collaborated on the research.

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What’s next

The researchers emphasize that further work is needed to fully understand the complex interplay between genetics, environment, and other factors that influence human longevity. Future studies may explore specific genetic markers associated with increased lifespan and investigate how these findings could inform personalized approaches to healthy aging.

The takeaway

This study significantly revises our understanding of the role genetics plays in determining human lifespan, suggesting that intrinsic biological factors account for over half of the variation in how long we live. These findings underscore the importance of aging research focused on the genetic underpinnings of longevity, which could unlock new pathways to extending healthy lifespans.