Most Helpful Guy
It's exagerated but there is some truth to it.
The average 18-24 year old woman does have a lot more bargening power than the average 18-24 year old man. And women do lose a lot of that power as they age. Men do increase in value as they become more established in their careers but if you don't take care of your looks then whatever appeal you gained from your career will be offset by what you lost in your looks.
So its not guaranteed that men will become more desirable with age but you do have the potential for that to happen if you work on your physique and take care of your skin/hair.