If these people had their own children, they could play games and do crafts at home. They could be Cub Scout leaders. They could be day camp counselors. There are plenty of opportunities for *parents* to do childlike activities.
Exactly - I love playing WITH my kids. I get to do things like play on playground equipment, have toy gun shootouts, wrestle, etc,
and it’s how kids spell “love” - t-i-m-e.