Not sure if it’s really an AIBU but do they matter? And what age gap is/ isn’t acceptable to you? Does it matter which partner is older?
So, for example, a 17 year old (F) dating a 27 year old (M)?. Or a 20 year old (F) dating a 29 (M)? Or a 30 (M) and a 47 (F)?
And does it matter how they know each other? Big age gap, but family friend? Was in a position of authority at “some” point - such as teacher/ boss/ instructor of some sort? Or not an age gap, but still in a position of authority? Such as boss or doctor?