It's not a big deal when there are not unbalanced power dynamics, and the younger ones are not women.
Most males have pedophelic tendencies and exploit young women and girls.
A 45 years old women with a 35 years old man is no big deal, or a 45 years old man with a 37 years old women as both already have lots of love experiences.
But a 35 years old man with a 25 years old woman is disgusting and unbalanced.
Most males don't want to deal with over 30 years old women because they refuse to deal with their crap

Is an11 year age difference that big of a deal ? I mean don't most people in Korean get married in their 30s anyway ?