Youth
Young Man
noun
Someone who is in their young years is a youth, or young man.
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.
その青年は十八才でした。
The young man was eighteen years old.
あなたは、なんて心の広い青年だ。
What a generous young man you are.
青年は大人になったらパイロットになりたいと言っていた。
The young man said he wanted to be a pilot when grows up.