"I don't feel like I'm 60, and Harry doesn't feel like he's 72," she explained. "So, it's just the number comes up, and you're like, 'Oh, f--k!' And that's what I'm always going to fight against. I've thought a lot about it, because I just turned 60 in July, and there's this whole thing about aging gracefully. And I'm like, 'F--k it. I'm going to age disgracefully.'"

And when it came to posing nearly nude for Cosmo, Rinna viewed the opportunity as a way to prove—especially to their model daughters Delilah Hamlin, 25, and Amelia Hamlin, 22—that you can be sexy at any age.

"I was so excited to shoot this cover because this is the kind of thing that moves the needle," she said. "It moves the needle for my daughters. It moves the needle for women to go, 'Holy s--t. You can do that. You do not have to give up, go out to pasture, calm down, turn it way down when you turn 60 or when you get older.'"

"You can't fight aging," she continued. "I don't necessarily need to look like I'm 20 years old, though that's fun if you can get it. But you know what I'm saying? It's about how do you morph yourself into this era and still feel good, be curious, be passionate, and be happy?"

Keep reading to celebrate Hollywood's longest lasting couples.