-Life is like an onion. You peel it off layer by layer and sometimes you cry.
-The life of every man is a diary in which he means to write one story, and writes another. ~James Matthew Barrie
-To know how to grow old is the master-work of wisdom, and one of the most difficult chapters in the great art of living. ~Henri Amiel
And finally
-The tragedy of old age is not that one is old, but that one is young. ~Oscar Wilde, The Picture of Dorian Gray, 1891
Proverbs are taken from here
I just enriched your collection of wise ideas, if you have any, but if not, I strongly advise you to make one, as it helps in life. This is a kind of self-education.