I'm approaching 32.
My first serious boyfriend and I got together when I was 16, we were together for 7 years, had two children, got "engaged" with a £16 ring from argos and then split up. He's now happily married.
My second serious boyfriend and I lasted 2 years, there was talk of moving in together until he realised that would involve split responsibilty of adult things and he suddenly went off the idea. He got with someone else the same year and asked her to marry him.
My 3rd serious boyfriend had been married and although we were together for 3 years, the only time he mentioned marriage was when he said "christ, I'd never do THAT again!"
Current boyfriend - love him to pieces, he says the same about me. Been together almost 2 years, lived together for 1 year of that - never any talk of engagement or marriage. I took the plunge last week and asked how he felt about marriage - his reaction was "oh ... don't know if I can do all that again, the last one nearly destroyed me". Things have been rather strained between us since 
WTF is it?? I WANT marriage yet deep down, I just know it will never happen for me. Why? it seems to happen for everyone else 