Take along a plate of sausage rolls, or cakes. Then just be honest. It is a wonderful opportunity to get to know your younger neighbours. Introduce yourself, that you are very new to the street and how lovely it is to have an opportunity to meet everyone. How nice it is to have so many youngsters around. etc etc. I'm sure there will be other "older folks" there too, so you can gravitate towards them if you feel more comfortable.
If you feel too stressed out then you are quite at liberty to go back home. Just don't start getting stressed before it even happens - worrying is difficult to stop, but doesn't help anything really.