► young having lived for only a short time and not adult or fully developed: Very young babies may sleep for most of the day. Dogs should be trained when they’re young.
► little/small very young, but older than a baby. Small is only used before adjectives and sounds more formal or literary than little: When I was little, I was very shy. A small boy looked out from behind his mother’s legs.
► teenage between the ages of 13 and 19: The TV show is popular with teenage girls.
► adolescent relating to or typical of a young person between 12 and 17: A lot of adolescent boys tend to be obsessed with sex.
► juvenile formal relating to children who are not old enough to be legally considered adults: Recently there has been a drop in juvenile crime.