I'm guilty of recently making an argument about a 3D character here which was nude & 'appeared' to be underage. I personally didn't have a problem with it (it was artistic & clearly not real) but I made the issue because I thought someone might have been getting preferential treatment, but I was clearly wrong & feel stupid for it.
There's no doubt that alot of people find youthfullness more appealing when thinking of beauty. Me personally,  yes I agree in some ways, but I really find beauty has no age. A favourite woman of mine is Marg Helgenberger, she's nearly 50, would people say she's not beautiful because she doesn't have that youthful look?