My pfb is almost 5. We live in a very, very quiet little square, full of kids. The area is monoblocked, but obviously traffic comes in and out. It is not a thouroughfare. All the kids play on their bikes, including ones ds's age. However, both dh and I are very nervous when he is out of our sight, which is frequently! He knows not to talk to strangers and not to go into his friends' gardens without letting us know first.
The other parents here are quite relaxed, but we aren't. Are we being silly?