What age do women stop saying "it's not fair"?

I actually thought this practice was stopped about 12 years. But now, at work, I hear women in the 40's still whining like little girls "But it's not fair." To how old women are supposed to learn that life is not fair?

"It's not fair" does not really come out of a discussion logic itself, but it * can * lead to one. I can only imagine that people would stop whining about what is "fair" (they say) and what is "unfair" (again, according to them) when they grow up, seeing life for what it is, and gain experience.