Why do parents wish they were kids and kids wish they were parents or grown?

Parents don't want to be kids they just dont want wrinkles or aching backs and joints.

Parents wish they were kids because they think being a kid is more fun and its easier! Kids wish they were grown-ups so that they wouldn't have to go to school any more (no more tests) and so they would not have to obey any one older than them!

Also, because of the very human tendency to want what one doesn't have & to have what one doesn't want.