Having a girlfriend who is a few years older than you says nothing about you, but worrying about it does. In fact, the only thing this tells me is that you are into this particular 31 year old woman. Um, I thought, petting my two-years-younger boyfriend. Yeah, I think you're probably too immature for this relationship, dude. Those doors close behind you and everything you think you know goes out the window because they can be themselves with each other. It would be okay if the man was 26 and she was 21 but the other way around feels too milfy, or cougarish.
It's not the fear of what's beyond, it's just that I might not respond!
Undressed: What’s the Deal With the Age Gap in Relationships?
I am not sure that I see that anywhere in your question. Is that really who you want to believe? She was 29 when they started dating, I suppose. Because, "An age and power differential is okay as long as it's the man in power"? We made a great couple, and were together for years as well. There are lots of advantages to dating a grownup.