I think it's harder as we get older. My best friend from college got married 2 years after we graduated and, even through he was 4 years older, they didn't have a ton of stuff and it fit well into their loft space. Tcbg and I moved in together 9 years ago and we both had been living independently for 5 years before that, so we had doubles of everything (furniture, couches, cookware, etc). It was a pain in the butt to move in together (worth it, obviously). You'll eventually figure out what you can both part with (and hopefully have a storage space for the stuff that you can't but it never leaves the box it was moved in).
Good luck! These are fun times...I kind of miss the newness of just having moved in together.