F21 M30 1 Month

I just recently started dating a guy who I’d met at my jujitsu gym. We hit it off instantly and honestly I can barely notice an age gap. We clicked even before we knew each others age. I’ve always been told I act older than I am since I can remember. We both had or have military backgrounds, had similar upbringing, same humor/views. I am already independent so I don’t need to rely on anyone else, I got my own apartment and started my military career at 17. I’ve been through a thing or two. He has too. Both strong personalities and don’t need each other but rather can enjoy each other and want to build a life together.

What are the possible problems? What should I look out for? What could be the red flags?

I don’t want to miss something that could later be a problem, how do I keep this relationship healthy? Any advice? Thank you!!

TL;DR

9 year age gap, we both are very similar, no problems so far in regards to maturity or life stages. What should I be on the look out for? Thanks.