From the cosmos.com article:
Yet another reason to get off the couch: physically active people don’t just look better – they may be biologically younger too.
British researchers examined 2,401 twins and found that those who reported having an active lifestyle had biological markers which appeared to be as much as ten years younger than those of their less active twins.
“A sedentary lifestyle increases the propensity to aging-related disease and premature death,” said Lynn Cherkas, geneticist at King’s College in London, U.K., and lead author of the study published in the American Medical Association journal, the Archives of Internal Medicine.
Read the article here.