Epigenetic Aging Helps Explain Differential Resilience in Older Adults

Area of Science:

• Gerontology
• Epigenetics
• Public Health

Background:

• Resilience to health hazards may increase with age due to the survival of more robust individuals.
• Cigarette smoking is a significant health hazard with known mortality risks.

Purpose of the Study:

• To investigate if accelerated epigenetic aging explains age-related resilience to smoking's harmful effects.
• To examine the association between smoking, mortality, multimorbidity, and epigenetic aging in older adults.

Main Methods:

• Analysis of a nationally representative sample (n=3,783) of older U.S. adults from the Health and Retirement Study.
• Mediation moderation analyses were used to assess the relationships between smoking, age, mortality, multimorbidity, and epigenetic aging.

Main Results:

• Older participants (aged 86+) exhibited a weaker link between smoking and mortality compared to younger cohorts (aged 76-85).
• The association between smoking and multimorbidity was weaker in the oldest cohort compared to all younger cohorts.
• Reduced association between smoking pack-years and epigenetic aging mediated these resilience effects.

Conclusions:

• Epigenetic aging may be a key mechanism underlying age-related resilience to health hazards like smoking.
• Identifying resilient subpopulations and understanding epigenetic aging can inform targeted interventions for vulnerable individuals.
• Epigenetic aging estimates could help identify individuals at risk for adverse health outcomes, enabling early intervention.