Ok .... Maybe someone has some tips for me

Im with a guy who is older than me... Ive always gotten the older man. But he is the oldest ive ever been with. We havent had sex yet and im not intimidated about it but i just wonder, will he thing my sex is "immature". I want to know how different it is as you get older. Im 19 hes 25 goin on 26 and I plan on having sex but I just want to be as prepared as I can be. What are the Dos and the Donts as you get older?

Tips?!

Thanks

J1babie