The boy loved baseball.
Police officers generally bring young offenders in to the police department's juvenile division.
I wasn't a naughty boy, but a dimwitted and hesitant one.
Someone of few years is someone who's young. But, back in the day the Japanese and Chinese tended to favor the boys, so this one means boy, usually a young boy. Sorry girls! Use your irritation at this kanji to remember it better.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.