Is 20 and 24 a weird age gap for dating?

So I'm 24 turning 25 later this year. I'm at university finishing late. This guy who asked me out is 20 turning 21 around the same time. He's cute and I would find him attractive if he weren't so young. Do you think this is a weird age gap with maturity and life stages etc?
Is 20 and 24 a weird age gap for dating?
Post Opinion