Age gap limitation for age of consent in Georgia?

Alright so i have these two friends ones 16 and she's likes and wants to date my other friend who's 20 but she's scared cuz when she was 15 she had with this guy who was 16 and her over protective uncle who is a cop found out and filed charges or something like that and he went to jail... ive been reading everything i can find on google but i can't find the answer im looking for i know the age of consent is 16 and as long as he isn't contributing to her delinquency there shouldn't be a problem should there? or is there a age gap limitation?