there is also an age gap vote and I prefer that... I think age difference is very vague. The proposer hasn't provided a description of what they mean but I think 'age gap' is the term de jure.

Honestly we need an confirmed age tag or some implication that tells whether the character is an adult or not.

Sex between a 20 year old and 21 year old is "age difference", so it should be defined better. Also it's not a particularly useful descriptor. Are the people looking for onee-shota the same type of people looking for old man and housewife, and both of those are age gaps.

this is not defined well

Age gap better

it needs some kind of description though. Like how small can the gap be?