imo its far more about independence than anything. if you can work and make OK money and so can your partner, thats equitable. the whole point is being able to know when and how to leave someone. the relationship can turn toxic if it isnt like that. 18-22 is still vulnerable imo, but once you are independent ages 23-30 i think anything above that age is fair game. its also just... is that older person a creep and is looking specifically for young people to date? thats a toxic attitude and as soon as you 'age out' of their favored range they will dump you.