expression, noun, noun-modifying (irregular)
age difference; age gap
Refers to the difference in age between two people. Often used in contexts like relationships, siblings, or colleagues.
There is a ten-year age difference between him and me.
Age-gap couples are not unusual these days.
Compound of 年 (とし, 'age') + の (possessive particle) + 差 (さ, 'difference').