Federal law makes it criminal to engage in a sexual act with another person who is between the age of 12 and 16 if they are at least four years younger than you. Each state takes a different approach as the age of consent has ranged from 10 to 18. For example, a state might set the age of consent at 18.

Is it against the law to date someone under 18?

As long as you are aware of the risks, the best judge is you. There arent any laws around being in a non-sexual relationship where one person is under 18 and the other over. Once you turn 16 its not illegal for someone to have sex with you no matter how old they are.