I have told
toddlers gently that something isn't nice, or to wait their turn, or 'no we don't hit/kick/bite'
small children to take turns, to play fair, to not screech
young boys to calm it down, to concentrate, to pay attention
young girls to not shriek or to be nice to each other
adolescents to stop playing football against my house
teenagers to pick up litter .. although would be careful in terms of groups of teens as I think they can dangerous .. and I think this because not enough people do any of the former or believe that anyone else has the right to ever do that to their children
and I would thank anyone who did the same with my children
I would never use physical force in any way against someone else's child unless it was to prevent harm to them or another or to cuddle a hurt whilst parent/carer gets over