Oh the man I loved at 18 would be. He was 24 when we met though and he he asked me to move in with him when I was 20. I didn't want that level of commitment so I broke it off. I haven't spoken to him for a few years now - I'm now 40 - but if he didn't want children later in life then I think we'd have been a good match.
At the time I said I didn't want children and he said he said he didn't care either way, but my experience has been that most men end up wanting children and he probably said "I don't care" just to please me.
I have occasionally wondered, if I met him again and he was childfree...but then again I'm very attached to my independent life and time changes most of us...