CNNers' advice to 30-year-old selves

First lady Michelle Obama turned 50 years old on Friday, January 17 We asked CNN personalities to impart some wisdom they have learned over 50 years Carol Costello: '90% of me thinks recognizing women turning 50 is a tad sexist' Christiane Amanpour says 50 is the new 20 and that everything gets better with age