Age gap?

So I’m 16 and all my friends are at least 18 and always have been since I was like 12, I’ve recently seen seeing a guy who’s a friend of a friend but he’s 22. We’re not shouting about it neither of us are those kind of people, it’s very private and not strange at all for me. I’ve been in a serious relationship before with someone a bit younger than him and this feels just as comfortable if not more. What do you guys think? Surely if everyone is happy and both people understand what is happening and consenting, where’s the issue?

Also I’m in the UK so it is legal.

Cheers☺️☺️