How long have you been together?
The age gap is less of an issue now, it'll become more of an issue when you're older so you need to consider that.
He won't just be older, he'll likely be less fit and well as you too.
In ANY relationship you need to have shared values, goals and things like sense of humour
In terms of your age now you're only 2 years older than my dd and she changes her views on major issues weekly! I look back at how I was in my 20's and I changed Soooo much in that decade.
I married around the same age to someone only a year older and very much regret it. Obviously the age gap wasn't an issue but with hindsight it was a mistake, I didn't know myself well enough let alone him!
IF you are meant to be together waiting 5-10 years will make no difference whatsoever and there's no rush to have dc unless there are fertility issues
Never been married - has he had a long term relationship? Doesn't sound like he's got much relationship experience which he should have at his age that in itself is a potential red flag
I know couples in successful age gap relationships BUT they met when the younger was in their mid 30's or older and had some life experience and knew what they were looking for in a relationship and had the confidence to not put up with crappy treatment and to spot red flags
At 22 most people are still pretty clueless tbh