The problem with being an adult is that you can afford all the great toys you couldn’t afford as a child but you can’t really enjoy playing with them as much. Take this Nerf gun for example. Boy I would have loved that as a kid. but I’d have had games to play with it and friends with their own Nerf guns. But we likely would not have been able to afford it. Now I could afford it but just shooting it around the house alone would be boring. I think this is what they mean by youth is wasted on the young.