I have had 2 19 yr olds ( not at the same time). One very mature for her age and a cut above the average sadly no longer working as it was only a stop gap. The other was also well above average but a little inexperienced as she was new to escorting and because of that, was a great find. She had had a few boyfriends her age etc., but guys her age were only interested in getting themselves off. So, as a mature male and her first, i was a bit of a revelation to her and we ran way over time as a consequence because she was enjoying herself so much. A great ego boost for me I must admit. I don't think she had had a real orgasm from oral before, but she soon got the hang of it
. Sadly, she only lasted 6 months on AW but I saw her a few times and covered a lot of ground. She even changed her profile to encourage mature males.
Apart from those 2, I like to stick to mid twenties girls that have had some experience of the world and a a bit more stable in the mind!