Betty White Reveals Her Secrets to a Happy Life at 100 Betty White will celebrate her 100th birthday on January 17th. She is on the cover of People magazine. About turning 100 she says, I’m so lucky to be in such good health and feel so good at this age. It’s amazing. As for her diet she jokes, I try to avoid anything green. I think it’s working. What are your keys to happiness and good health?