I’m 36 and have been with my current girlfriend for almost 5 years now - my longest relationship yet. We live together & everything else couply, just not married. I see marriage as unnecessary pressure that has a tendency to put strain on the relationship. Right now if we’re happy together we stay, if we’re not we split. Simple. Marriage complicates it.
I actually do have a 14-year-old son, but with another woman (she’s the extremely independent type; I have sole custody but we’re co-parenting nicely). I don’t want any more kids.