You do you.
Most of my partners have been at least 10 years older than me. When I was 19, my then-boyfriend was 32, so pretty similar age gap to you two.
Him and I were together for 5 years, and although the romantic relationship didn't last, we've been like family to each other ever since. We even live together now and have pets together. We're totally ride or die. It's awesome.
The only thing I'd say is to go into marriage with your eyes wide open. Consider the financial side of things carefully - especially what would happen to YOU if things didn't work out.
When I was with the boyfriend I mentioned above, I lived with him, contributed to his mortgage, but my name wasn't on anything. He bought all of the furniture and things for the place. So when we broke up, I literally had nothing. I didn't even have savings. So, not to be cynical, but these are the kind of logical things you need to think about, regardless of the age difference.
The age difference might matter eventually, or it might not. There is no way to predict. But that's the same for any relationship.