Here is my response on given questions in the activity. Dealbreaker or workable? Not a dealbreaker for me. But the bigger the gap, the more it depends on where both people are mentally and emotionally. In my opinion 8-10 year gab is normal thing and Usually manageable but 12–15+ years, it need special effort to come over.
Comfortable range? As I mentioned above 5 to 10 is still okay. Beyond that, it starts needing more effort to stay aligned.
Younger or older? Male should be elder then female. Vice versa also fine but first statement is more valid. It gives more responsibility to male and more coverage to female.
One real tip. Don’t romanticize the gap , if feel uncomfortable, talk about the future early. Things like, marriage timing, kids or no kids, career priorities, lifestyle pace.
A lot of age-gap relationships fail not because of age, but because they avoid these conversations until it’s too late.