This is a comparison between a super model woman (even some of those Instagram hot chicks) and any high end sports car.

Both are symbols of status and beauty, however in fifteen or twenty years, the woman (if you started dating when she was 18) will hit the wall. A car you can spend a fortune on restoring and replacing engines, transmission, steering, sound system, etc. It's the beauty of machines. You can always improve them and replacing a machine is easier because they are literally made in factories.

That woman however would need a fortune of plastic surgery to stay competitive with women even close to her age (assuming her age was now 35). Vaginal rejuvenation, botox, it's a process. But still she will never reclaim her youth. In comic books and movies a sexy vampire woman can be the ultimate predator because she never grows old, and never dies. She never experiences "the wall".