I pushed an elderly man smoking in front of a store

I told an elderly man smoking in front of a store
not to smoke, but during the
struggle, I pushed him and he fell down.
I am currently talking to the police and providing my personal details while writing this.
Will the settlement fee be expensive?
I don't have any criminal record or fines, though. ㅠㅠㅠㅠㅠㅠㅠ