I agree with the above.

Additional source:

"The Analects":

"The Analects of Confucius·Wei Zheng Second"

Confucius said : When I was fifteen, I was determined to learn; when I was thirty, I was established; when I was forty, I was not confused; when I was fifty, I knew the destiny; when I was sixty, my ears were obedient; when I was seventy, I followed my heart's desires without going beyond the rules.

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