10/22/2026
A new study looked at 107 married or cohabiting couples, ages 40–87, measuring marital happiness alongside sleep, diet, physical activity, and three markers of biological aging: DNA methylation, telomere length, and p16INK4a expression. Researchers followed most couples for two years.
Higher marital happiness was associated with some markers of slower biological aging among couples with healthier habits.
But among couples with poor sleep or unhealthy diets, higher marital satisfaction was also associated with faster telomere shortening and accelerated DNA methylation aging.
A happy relationship is crucial. So are the routines you build together.
Source: Wilson, Stephanie J., et al. "Is a happy marriage a double-edged sword for biological aging? Preliminary evidence for the moderating role of couples’ health behaviors." Brain, Behavior, and Immunity (2026).