I have to admit I am older but for me a girl still looks most beautiful aged 20-25, I keep it to myself in todays society because I feel I would be branded a pervert.
I always see these posts on Reddit by people who say "they cannot find a 20 year old attractive, and can only look at 40 year olds" - I just dont understand it. Yes 40 year olds can be sexy - but never as sexy as a young woman in her body toned, smooth skinned prime IMHO