Having worked in offices where girls who are 18-21 start, at 18 generally they look great, by 21 they are average and then 23 lost it all. I had a 17 year old with ridiculous tits working in an office but you could tell was going to lose it and from her Facebook pics she was gone by about 19-20. You rarely see girls over 21 looking good. One i worked with was 28 when i was younger and her body was unreal i asked what training she did she only did dancing when she was younger. But very rare.
I happen to work in a place now where i see some 14-15 year olds come through. Some 14 year olds are fucking HOT. I didn't even think some were 14 they looked 17. I don't agree that's pedo they are basically as developed as an 18 year old just without losing it already.
But as i said, if women take care of themselves they can look great up to 45-50, as good and i think better than any 18 year old. But it's very rare.