If they are girls then in my mind they're under 18. I think it's highly patronising to call a grown ass woman a 'girl'. Once they are both adults, they can and should both use their individual adult judgment to make a joint decision. Two things. Are you an adult, and do you consent.... everything else is playing with subjectivity.... like this. She's 19 and comes from affluent West Coast America, she's had plenty of boyfriends, been in a few semi-serious relationships, he's 37 and works at a hotel in a resort her family go to. He lives with his Mum and supports his nephews and nieces - he's never been in a relationship before. She notices him at work and falls in love with his caring family centred nature. Who is the more mature here?