Hi. I am looking for a precise definition of the word "guy." I know it is used for males. But is there a certain age group for which it is normally used? I've heard of it being used for males of all ages, but my impression is it's used more to describe either men or young males that we can call adolescents (in other words, males from the age of 12 or 13 roughly), than for people younger than that, in other words, children. Am I right?