From the sources
Raise the Youth
And This is the Difference
Show Respect
Do Not Cast Me Away
We Should Stand
Children’s Children 
The Way They Should Go
Remember the Days
Who is an Old Woman
A Man Who Does Not Feel
Hillel the Elder
Man Should Pray for his Old Age
Rabbi Tarfon Had an Old Mother
Stand Up in the Presence of the Aged
Blessed Are All
The Glory of Young Men
Raise the Youth

It is written:

"Raise the youth according to his ways, so that when he grows old it shall not abandon him".  (Proverbs, 22, 6)

Yet one ought to continue to educate oneself also in his elderly years.

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