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Some say life begins at 40; others say "don't trust anyone over 30." Then there's Kim Kardashian, who says she feels old -- and she just turned 29 yesterday.
"I'm not going to lie, I woke up this morning feeling a little old!” Kim told People.com on her birthday. "It's my last year in my 20s."
But not all Hollywood starlets feel like they're eligible for an AARP card as soon as their 20s are over. Courteney Cox, who is starring in a show based entirely around the concept of sexy "women of a certain age," says she thinks her fellow females are looking less and less their age (whatever that means).
"People are taking better care of themselves," 45-year-old Cox said in an exclusive iVillage video interview. "I don't know why women are looking better, but they are. We're feeling more confident and better and stronger."
As for the age bias in terms of romantic relationships -- which her show, Cougar Town addresses head on -- Courteney thinks it's a bit backwards.
"I don't understand why it's okay for a man to date a younger girl, but it's not okay for a woman in her 40s to date a man in his early 30s or late 20s," she says.
Courteney's fellow Friends alumna, Jennifer Aniston, is another perfect example of a woman who looks like she's been taking better care of herself than actresses half her age (she turned 40 in January). Then of course there's Madonna, whose fit physique is something to be in awe of, no matter what your age.
Do you think Hollywood puts too much of an emphasis on age? Chime in below!