Hmmm ... not sure, kind of young I guess. When I was 16 I decided to let me goatee grow in for a while but kept the rest shaved. A couple years later I said fuck it and went for a full beard.Let me try a different question...
How old were you when your beard truly started to come in?
So I'm really not quite sure at what age I would have been able to grew in a thick full beard. I guess high school though?