Yes. Looking young is an advantage. At 28 yr old people guess me from 20 to 23.
I also hooked up at parties with some 17 yr olds and once a 16 yr old (not pedo i just am bad at guessing ages and was drunk). But that must mean that people perceive me as young even tho im nearing 30.
If you are 18 yr old its bad but as soon as you are 22-23 it starts being a good thing.