I think this movie is for someone of the age of 14 because....
Just like the title above the only reason I think this movie is made for teens around the age of 14 because the Godfather is a type of movie where you have to be older to get this movie and it's message. I also think it's for teens because of my perception of a child vs teen attention span since this movie is on the slower side when it comes to the movie pacing. This doesn't mean all older people have great attention span and all younger people have worse attention spans, but what I mean is that I consider what the movie is about and how 14 and older can probably grasp the meaning better than a younger child plus the pacing, which gives me the estimate I am saying right now.
When it comes to the sex, violence, and profanity, I honestly don't think it's that bad compare to other movies. I think there's about 2 sex scene and one of them being very brief. Both the violence and profanity are littered in this movie rather than it being a violence and cursing feast. I do think however, the profanity isn't that bad and it isn't used that often. When it comes to the violence, it's mainly either strangling someone or shooting someone. There's only two "grand" murder and core scene, with one involving a decapitated head (with it being sort of brief) and the other one being an expulsion (no gore though). It's really depend of your view on what you consider what's too violence or what's isn't too violent .
The only reason I'm putting this as too violent because I want to be safe with my warning to the parents.