Are you okay with them? Is there a minimum/maximum for you? What comes to mind when you see/encounter them?
My opinion is that dating age gaps become less and less concerning the older you get. I also feel that the stage of life you are in and your experiences play a role. If a 30-year old were to date a 19-year old, while they are both legally adults that is something I would find very odd. But that’s just my opinion, I know some people don’t care.