Universal DNA methylation age across mammalian tissues.

Researchers studied 11,754 tissue samples from 185 mammal species, including humans. They measured DNA methylation, chemical tags that help switch genes on or off, and compared these patterns with each animal’s actual age. They found that some age-related changes were shared across species and tissues. This allowed a mathematical “clock” to estimate age from a tissue sample, although accuracy varied between species and tissues.

What this means for you: This is a research tool, not a proven health test or anti-aging treatment. You can ignore products claiming this study shows that a supplement or treatment will slow your biological aging.