Nothing wrong with enjoying a date.
The age difference is not weird at all.
It's actually not even about age, but about maturity levels. He could be more mature than you, for example.
What do you want from a relationship? Are you wanting kids, mortgage, etc. ? I think it would be a fine idea to let him know what you are looking for, so you can both know where you stand.
Not 'I want to marry you and have your children' but 'I want to get married and have children in the next five years, and this is why I am dating, not to say that will be you, but this is something I want' and ask what he wants.
Then enjoy the date whatever the answer. He wants kids in the next ten years? Great, let's have a date, or a few, a laugh, but you will continue on your search. Or, let's have this date then call it quits but nice to meet you.
He want the same things and like you a lot, and then you would go for it.
If you find it "icky" then be fair on him and own that and only have the one date.