You get older every day. But how old are your cells and organs, really?

How old do you feel? Experts explain how subjective age works, and why it matters. (Getty Images) Your heart tells you you're 27, but your birth certificate says 42. For many of us, there’s a big ...

Age is just a number—and one you may be able to change. At least that’s the pitch behind Tally Health, a new startup that’s among a crop of companies selling tests that offer to tell consumers their ...

Clocks coming out of a large clock as a 3D illustration. We age along two clocks: a chronological clock and a biological clock. The former is just a measure of how many birthdays you have celebrated — ...

They say “age is just a number” — and now there’s scientific proof to that effect. The amount of candles on your birthday cake has little to do with how old you are biologically, according to a recent ...

The younger you start investing for your future, the better. That’s not just some empty, general statement—math bears it out. The longer you have to invest, the more compounding works to your ...

My 70-year-old father tells me he’s routinely startled simply by seeing his face in the mirror. “Who’s that old guy?” he thinks. Science shows he’s far from alone in this feeling. I’m 43, so this ...