Is 21 the youngest age a guy can date a girl where it’s not creepy?

Okay ever since Leo DiCaprio dated that 19 year old girl which is legal everyone called him out for it. Now while someone at least 18 is legal I have realized that it is creepy and which is why I think that the youngest age for someone to date should be 21.

Is 21 the youngest age a guy can date a girl where it’s not creepy?
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