The law criminalises people who have sex with under-16-year-olds. So, if an 18-year-old is having consensual sex with a 15-year-old, the 18-year-old is guilty of an offence and the 15-year-old is the victim.

Can a 18 year old date a 14 year old legally?

If you are 18 and she is 14, you could be arrested and charged with serious sex crimes, even if you dont actually have sex. Thats the kind of crime that can stick with you for life.