It is not illegal for a 24 year old to date an 18 year old.

Can an 18 year old date someone in their 20s?

3 attorney answers Two consenting adults can date and have an intimate sexual relationship. If you are 18 or older, and she is 18 or older, then there is no problem.

Can you be 21 and date a 18 year old?

As long as both parties are 18 years of age or older, not being forced, not unconscious, not too drunk to consent, not mentally impaired to the point they cannot consent yes, an 18 year old and a 21 year old can have sex.