This comment is disgustingly old. For context I'm 25, but nothing has really changed. Except when shaven I now look 15 or 16.I look younger. I'm 19, I turn 20 in exactly a month, and I look like I'm 13... when I'm shaven. When I have my facial hair, I look I'm 15 or 16.
I act younger, but at the same time I act older. It depends really. If I'm around my friends I act younger because... why not? Just because I'm getting old doesn't mean I have to grow up, but if I'm at work or in public, I'm actually very adult like.