I think these sorts of sentiments are indicative of the ageism which still pervades human society. The old fear change, and they are afraid to admit the failures of their own generation. To destroy a bad society is a good thing.
Youth is the leaven that keeps all these questioning, testing attitudes fermenting in the world. If it were not for this troublesome activity of youth, with its hatred of sophisms and glosses, its insistence on things as they are, society would die from sheer decay. It is the policy of the older generation as it gets adjusted to the world to hide away the unpleasant things where it can, or preserve a conspiracy of silence and an elaborate pretense that they do not exist. But meanwhile the sores go on festering just the same. Youth is the drastic antiseptic… It drags skeletons from closets and insists that they be explained. No wonder the older generation fears and distrusts the younger. Youth is the avenging Nemesis on its trail…
Our elders are always optimistic in their views of the present, pessimistic in their views of the future; youth is pessimistic toward the present and gloriously hopeful for the future. And it is this hope which is the lever of progress—one might say, the only lever of progress…
The secret of life is then that this fine youthful spirit shall never be lost. Out of the turbulence of youth should come this fine precipitate—a sane, strong, aggressive spirit of daring and doing. It must be a flexible, growing spirit, with a hospitality to new ideas, and a keen insight into experience. To keep one’s reactions warm and true is to have found the secret of perpetual youth, and perpetual youth is salvation.
--Randolph Bourne, Youth and Life