Fortysomethings Have Sex: Deal With It.
A lot of posters on this board complain that 41 year old Cameron Diaz is too old to play a 41 year old character. They don't even mention why they think that Annie is any younger, they just assume that. It's as if someone made a sex comedy about 90 year old people, and these posters would complain that Betty White is too old.
What they're really saying is that they find the thought of fortysomethings having sex to be icky. I'd love to be around them when they reach that milestone, and discover that the sex drive does not die out then. (Women do reach menopause in their mid-40s, but I haven't heard of CD having hot flashes yet.) It would be like a homophobe finally having to admit that they themselves are gay.
So if you're one of those people who are bothered by the thought of middle-aged people desiring sex, understand that it's your narrow world view that causes your discomfort. Deal with it.