Authors:

People like to say, "You're only as old as you feel," but it isn't true. It's just something old people say to make themselves feel good about their age. You're as old as you are.

Andy Rooney (2012). “Not That You Asked...”, p.7, Random House
People like to say, You're only as old as you feel, but it isn't true. It's just something old people say to make themselves feel good about their age. You're as old as you are.