“Very late in life, when he was studying geometry, some one said to Lacydes, "Is it then a time for you to be learning now?"”

—  Diogenes Laërtius

"If it is not," he replied, "when will it be?"
Lacydes, 5.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 4: The Academy

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Diogenes Laërtius 107
biographer of ancient Greek philosophers 180–240

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