I'm 28 he's 20 years old, is that too much of an age gap?

So I recently started talking to this guy at my job he's been trying to talk to me for about a Month now but I've been brushing him off because he's only 20 years old and I have 2 kids and to be honest I'm not looking for a fling or "fun" I want something long term. Im not sure if I'm overthinking this or if I should live in the moment and get to know him. He knows that I have 2 kids he said he's okay with it but I just have an uneasy feeling I mean what 20 year would want to be someone's stepdad.

I'm 28 he's 20 years old, is that too much of an age gap?
Post Opinion