4. Cameron Diaz and Benji Madden
Cameron Diaz was 42 when she married Benji Madden in a secret ceremony at her LA home in 2015. For her, the reason she waited so long was simple.

"I think it's a matter of – I just hadn’t met my husband, you know? I had boyfriends before. And there’s a really, really distinct difference between husbands and boyfriends," she shared on a panel at the Goop conference.

"We women are objectified so much," she continued. "And somehow my husband has just been able to kind of show me what it’s like not to have that be apart of a relationship, and being an equal."