I think there's a lot of room in the college-theme, because 90% of the games that attempt it are garbage. I think your model can pass as a college age character. The power of suggestion is real, and if you told your players that she was 21 I don't think that would break any suspension of disbelief. Now, if you told them she was 18, that would probably be too much. But these 3d models allow for the players to fill in some of the gaps, so if you tell them she's 21 I think they will accept it. It's just too difficult to really design a model that looks distinctly 21 but NOT 25.
Somebody really has to show me how to portrait a 4 years difference efficiently i would easily miss judge someones age in that range if he/she stood right in front of me after puberty.
It's this fucking situation for some Porn Producer Girl comes to casting "You want todo this really ?"
Ok and you are 20 according to your ID i see "She giggles inside herself, yes he caught it gotcha"
The First time they show they have awesome Acting capabilities and you just landed with 1 Feet in trouble.
"You fooled me (Traci Lords) achievement acquired"
And heck some are so good they gonna fool their same Gender it doesn't matter.
Then you put them in the Shoolgirl look and naughty Makeup and you go lower edge in perception and don't understand the World no more.
You slowly become suspicious about her words but she makes some BAM and People love her so you are even more fucked up now.
And slowly you think "She likes it does it really matter,she lied she acted criminal she abused me to reach her target and in the minds of people they want her to be 20 ?"
Virtually im constantly in front of thinking about this in my Work and how todo the right thing.