My son us 7, so he is not outside alone without a responsible adult, therefore I have not talked to him about 'stranger danger'. He, like me will talk to people whether we know them or not, it's what we do in our community and outside it. When the conversation is over, we say goodbye and walk away, so he learns from that. It's not dangerous to talk to strangers, it's dangerous to go off with them without an accompanying familiar adult. I love that he is comfortable talking to people of all ages. When he is old enough to go out alone, I shall tell him the rules that will apply then, which will be different. I always ask him how his day was, how he is feeling, the best/worst parts of his day. Sexual abuse is more prevalent amongst family members or family friends than outside of it, because it's easier for them and it's also easier for them to sustain the abuse. I make sure I know how my son is feeling emotionally and try to ensure that he is able to talk to me about anything that concerns him.