Yeah bruh it's not the actual gap ffs people, it's the age gap RELATIVE TO THE PEOPLE'S AGES
3 year gap between a 15 and 18 year old: BAD. ILLEGAL. FUCKED UP.
3 year gap between a 30 and 33 year old: they're practically the same age
10 year gap between a 25 and 35 year old: hmm kinda weird, might let it slide, but no.
10 year gap between a 60 and 70 year old: yeah trust me you're good.
9 year gap between a 20 and a 29 year old: let me put this into perspective, person A could be in their second year of college and person b graduated 7 years before. That's weird and they're at INFINITELY different stages in life.
9 year gap between a 46 year old and a 55 year old: they're both middle aged, they're both at the same stage in life, they've probably both have had some sense of stability for a while now and probably no wildly violent life changes like high school/college/first job/first partner have happened in a while. It's FINE.