I dont see a problem with that. A young girl can give you a tight pussy, thats all. But a matured woman can teach you how to have sex, that will eventually help you in future.
Sex is not just 1-2-1-2 exercise, there are lot of tricks and techniques involved. I suggest you, ever get a chance to fuck a matured lady (of course not a family member), have sex and watch out her every movement. You can learn a lot.
For young girls, rather than young guys, get a older man, you can learn.
This is not encouraging you to do, its a choice I am putting forward, give with an option what you should chose.