I think kids should play games. Someone somewhere said

Play is the work children do. And they need to do it well and often.

Some, not all, of this play can be on screen and online. Children need to learn how to live in a digital world. But they should not neglect to develop their imaginations without digital help.

However, I do not think adults should engage in long-term activities that have little or no purpose. It is a self-defeating endeavour that will lead to a terminal lack of productivity.

The challenge is to discover when you are not a kid anymore...

Thank you @ziggypepper. I'm from Kryptonia.