Paul McCartney is one of the most famous people in the world. His music has been relevant for nearly 60 years and he's still selling out arenas.
Aside from him getting busted for weed in Japan in 1980, (big deal!) you never hear anything bad about him.
That doesn't mean he's always right or has great advice, but to me, that's someone who might have something to tell us that worth listening to.
Here's an article with the one thing he wants you to do just once a week.