i'm not sure how anyone can guess a person's age by looking at their ass, since i know lots of hot older people and heavy younger people.
that ass is at least an 8.5 out of 10, and if she was posing provocatively, i'd rate higher for sure.
as far as the age, i could easily see that ass being early or mid twenties no problem. your average girl isnt some super skinny rail thin model that looks starving. that's a sweet ass, and as a woman who likes other women, i'd LOVE to see more of that ass. my b/f agrees btw, he'd totally hit that.
