PEOPLE Magazine 40th Anniversary

Look Who's Turning 40

From Leonardo DiCaprio and Victoria Beckham to Hello Kitty and Happy Days, see who's celebrating the milestone with PEOPLE

CHRISTIAN BALE

This former Batman has famously beefed up – and down – for roles, but he acknowledges that it's no longer so easy. "I think I'm certainly getting older. I thought I was going to lose the weight I gained for American Hustle. I said, two months, flat, that'll do it. I was 185 and I went up to 228 for it. And I'm still working that off! It's almost six months later," the star, born Jan. 30, told USA Today. "Now I know that when I was in my early 20s it would have been two months and that's it."