This series was created for Google, the Buck Institute, Optispan and Phenome Health by Scientific American Custom Media, a division separate from the magazine’s board of editors. How old are you? It’s ...

People in the same age group tend to have similar interests and even if two people are complete strangers, they still might share some of the same memories. For example, remembering what TV shows they ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." You’ve heard it for years: Age is just a number. But there’s been a huge focus lately on biological age, ...

We all like to imagine we’re ageing well. Now a simple blood or saliva test promises to tell us by measuring our “biological age”. And then, as many have done, we can share how “young” we really are ...