no, stop. think this through - and think about what you're saying.

we have a choice:

1) we can tell the kids they can't go out and play because they might harm the elderly, or

2) we can tell the elderly they have to stay inside so the kids can go out and play.

and, you think we should tell the kids to stay in to protect the elderly?

really?

no - let the children play. tell the seniors to stay in - and tell them to make sure their lawns are marked.