No matter how mature you think your 13 year old is, he probably isn't ready for this. I ( this may sound weird ) think that one your child is 17 or 18 he should watch this movie, but not before, this movie broke the record for most swear words in a movie. It has constant drug use, which in parts is potrayed in a bit of a "good way" and alot of full frontal nudity, but hey after a person is 16 they are legally allowed to have sex. Seeing nudity after 16 ain't the problem here. The drugs are, potrayed good, and the language is veryy iffy. But it has a bit of a good side to it. Its a movie about Jordan Belfort, a real scammer who scammed millions of dollars and became rich, he started having regular sex with prostitutes and regular use of drugs. It is based COMPLETELY on a true story. If you do think about showing this to a mature 17 year old. Then tell them about the real Jordan belfort, who has overdosed on drugs, broken up with alot of wives cuz he was cheating on them. And gotten arrested. Tell him how he did bad things and ruined may lives from his scams, then show him the movie, it makes him look good, but still shows that he was a criminal.