"If the truth be told
Experience is wasted on the old
And youth is wasted on the young"
The young have A RIGHT to be stupid. The old have A RIGHT to be ugly.
Sure, both of them are thinking to have quite good use for what the others are owning. But not being able to fully appreciate what you have and overestimating what you don't have is just human. In no way does it mean that what you have is 'wasted' on you.
Isn't it charming that aging only means growing from being more beautiful and not so smart to being smarter and still not that ugly? If we had to grow from being beautiful and smart to being ugly and stupid (as some really "young" ones seem to be thinking) we had to shoot ourselves on the spot (as some of them do).