Social science writer Arthur Brooks has figured out how you, yes you, can be happy later in life. He details it all in his new book, From Strength to Strength, but the gist of it is...maybe relax a little. Brooks argues that for people who work too hard to have it all it can be very upsetting when that part of their life is over. The good news is you can start working on your future happiness now. Brooks told NPR's Mary Louise Kelly you have to do the work when you're younger: You can't "leave your happiness up to chance."