“How oddly situated a man is apt to find himself at the age of thirty-eight! His youth belongs to the distant past. Yet the period of memory beginning with the end of youth and extending to the present has left him not a single vivid impression. And therefore he persists in feeling that nothing more than a fragile barrier separates him from his youth. He is forever hearing with the utmost clarity the sounds of this neighboring domain, but there is no way to penetrate the barrier.”

Source: Growing Up Absurd (1956), p. 149.

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

Variant: He that hath a beard is more than a youth, and he that hath no beard is less than a man. He that is more than a youth is not for me, and he that is less than a man, I am not for him.
Source: Much Ado About Nothing

"Experience" (1913) as translated by L. Spencer and S. Jost, in Walter Benjamin: Selected Writings, Vol. 1 (1996), pp. 4-5

"A Piece of Steak" in The Best Short Stories of Jack London (1962) ISBN 0-449-30053-6

Original in German: Einen solchen Standpunkt fand Goethe früh in Spinoza, und er erkennet mit Freuden, wie sehr die Ansichten dieses großen Denkers den Bedürfnissen seiner Jugend gemäß gewesen. Er fand in ihm sich selber, und so konnte er sich auch an ihm auf das schönste befestigen.
Johann Peter Eckermann, Gespräche mit Goethe in den letzten Jahren seines Lebens, 1831
A - F

Bacchides Act IV, scene 7, line 18.
Variant translation: He whom the gods love dies young. (translator unknown)
Derived from Menander's The Double Deceiver; but only the Plautine version was known until the rediscovery of Menander in the 20th century; sometimes translated as "favor" instead of "love".
Bacchides (The Bacchises)

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 345.

Un Art de Vivre (The Art of Living) (1939), The Art of Growing Old