"I think that women find their strength and power in their sexuality, in their sensuality within, [through] getting older and being secure within that," said the 39-year-old actress when asked to describe womanhood.
"It's ironic that we've built the beauty world around 20-year-olds, when they have no [expletive] concept about wisdom, what life is about, having a few relationships below [their] belt and feeling hardships, to grow into [their] skin and feel confident within [themselves] and to feel the value of who [they] are, not because of a man or because of something like that."
Theron went on to criticize the double standard that men get better with time and women, who "come into their prime at 40," are considered "a dead flower."
Asked about her relationship with fashion, the Monster Ball star said hers was "a really nice closet." She explained she feels "lucky" that fashion houses send her free garments constantly, but admitted giving some away so her girlfriends because "I'm always very aware that I'm one person and I can't wear everything."
"My whole concept in life is if you're not using it, you should give it to somebody else so they can use it. And so my girlfriends are really happy about my theory on that. We have a name for it; we've called it 'Narnia.'"
The actress also gushed about her ten-year partnership with fashion house Dior, calling the brand "brave" for allowing her to look however she has to look for a role in their advertisements.
"There's never been a moment -- I have maybe gained weight or shaved my hair off or done something for a film -- [that we couldn't] integrate into what we were doing here," she explained. "There's always been a celebration of what is that moment, whoever I am at that moment in my life. [It] is a very real way of looking at beauty. [If you want to] ask the question what is beautiful? It's the life that you lead. It's the life that all women lead."