No one can escape physical aging, darker skin does hold out better though.
What people actually mean is that men get better as they get older, they are more attractive in some aspects (intellect, resources, clout, experience, etc) and lose in other aspects (physical looks most of the time, I think that's it, maybe stamina). Its because of what each sex values, I didn't make the rules.
On the other hand, what men value in women (physical beauty and fertility) starts to decline, relatively, early. And women dont really have anything to compensate for losing their looks, From the male/dating perspective, I'm not saying women are useless at 30+ in other aspects of life. But men are not attracted to what women are, we generally dont care about your education, your job, how much money you make, clout or experience (hell, we prefer inexperienced women, while vice versa drys p*ssy up like the sahara). To us, if we think you look good, then that's it. But the thing with this is, there are always younger, better looking legal women every year.
Thats why its more common to see a girl who works at some place in a mall with a male partner who has a better paying job, while the opposite is rarer.
Also why women's dating prime is 16-25 and men is 25-39.
But of course, Coli women are the absolute exception (as always), of any easily observable trend and they defy biology, so these things don't apply to them, so don't sweat this post.