“Learning acquired in youth arrests the evil of old age”
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
Context: Learning acquired in youth arrests the evil of old age; and if you understand that old age has wisdom for its food, you will so conduct yourself in youth that your old age will not lack for nourishment.
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes

Swenson, 1959, p. 21
1840s, Either/Or (1843)

“Youth is the time of getting, middle age of improving, and old age of spending.”
3.
Meditations Divine and Moral (1664)

“A happy youth, and their old age
Is beautiful and free.”
The Fountain, st. ?? (1799).
Bartlett's Familiar Quotations, 10th ed. (1919)

“In youth we learn; in age we understand.”
In der Jugend lernt, im Alter versteht man.
p. 13 http://books.google.com/books?id=DOEPAAAAQAAJ&q=%22In+der+Jugend+lernt+im+Alter+versteht+man%22&pg=PA13#v=onepage
Aphorisms (1880/1893)

“Youth is a blunder; manhood a struggle; old age a regret.”

“Age is never so old as youth would measure it.”
"The Wit of Porportuk" in The Best Short Stories of Jack London (1962) ISBN 0-449-30053-6

“The heads of strong old age are beautiful / Beyond all grace of youth”

“Strength and beauty are the blessings of youth; temperance, however, is the flower of old age.”
Fragment quoted in H. Diels and W. Kranz (eds.) Die Fragmente der Vorsokratiker, Vol. II (1952), no. 294; reference taken from Webster's New World Dictionary of Quotations (2005), p. 261

“In youth, we run into difficulties. In old age, difficulties run into us.”
Josh Billings, as quoted in Mac's Giant Book of Quips and Quotes (1983) by E. C. McKenzie
Misattributed