Because they are pretty, have unwrinkled skin, no stretch marks and their boobs don't sag? Men are very visual.
Havent read the thread but this stood out to me.
So all women in their 20s are perfect, sylph like creatures?
I dont know about you, but I have seen plenty of obese women in their 20s. Maybe not wrinkles but they will certainly have stretch marks at that weight and sagging breasts again due to weight.
I am well into my 30s but I have better breasts and less stretch marks than an obese 20 something.
It is all relative. 20s doesnt automatically mean perfect. Far from it.