We're all a certain number of years and months and days old, but alongside this chronological age is a biological age : the rate at which our bodies are wearing down. Now it appears that steady and settled daily rhythms – with regular, consistent time carved out for both rest and activity – might help to slow down this biological aging. That's according to new research led by a team from the Johns Hopkins Bloomberg School of Public Health. We know that daily rhythms tend to change as we age,