6-7 years old. Some barbarian type older kids pounced on my little cousin (5) and stole her candy money. She came back crying, so I walked her, back to the store, to show me where those heathens were. I went to their house and asked for the mother. Mother comes out and I told her to "discipline her kids" that "my Dad would sue her and put her kids in jail". She did stifle a laugh at the moxie of it all, but promised she would take care of her errant kids. (Everyone else in the fam had said let it go, you can get hurt.)

I learned that standing up for the right thing AND having the moxie to fight for it (with words first) is likely genetic. You either have it or not.