Next time you complain that your body’s getting old and wearing down in your thirties, think of Serena Williams and Roger Federer.

Two of the top tennis players in the US Open this year are both in their mid-thirties. Williams and Federer are both age 34 and at the absolute top of their tennis games. Serena is currently ranked Number 1 out of all women tennis players in the world and Federer is Number 2 of all the men. And neither has any intention of retiring anytime soon.

I’ve been working at the US Open for the past two weeks, and have been simultaneously watching Federer and Williams play their hearts out and listening to people in their 30’s complain that they’re old and tired. It’s sort of a funny dichotomy.

Serena came in first place in 3 out of 4 of the major tournament titles this year- the Australian Open, French Open, and Wimbledon. She made it to the semi-finals of the US Open. At 34.

Federer was possibly about to retire two years ago. He was in a slump and his back was bothering him. But now, at 34, he’s not only made a comeback, but he’s changed and added to his tennis style and has been playing with ease and confidence throughout the Open. Federer is not only the second best tennis player in the world- he’s also the father of two sets of twins! Talk about balancing career and family! Federer plays in the finals today against the reigning Number 1 tennis player, Novak Djokovich.

So, as Jane said in a recent post, stop saying you’re old in your thirties! You’re only as old as you believe you are!