All diseases run into one, old age.
It is sad to grow old but nice to ripen.
Be on the alert to recognize your prime at whatever time of your life it may occur.
As long as any adult thinks that he, like the parents and teachers of old, can become introspective, invoking his own youth to understand the youth before him, he is lost.
We are always the same age inside.
What makes old age so sad is not that our joys but our hopes cease.