Wanting to start young

Hey guys! So I turn 21 in December and I have an AMAZING fiancé who turns 21 in May. We have been living with each other for almost a year now and we both have amazing jobs. I'm wanting to start a family asap. I want to be young with kids and my fiancé wants to have kids at such a later age. He wants to go on vacation with me and travel the world before kids and I want to do it after... of course I'm not going to make such a big deal about this but I'm curious what you guys think! Kids at young age or kids at a later age?