Meet Sholom Ber Nezhni.

"They say that the mind becomes less sharp when you stop working, so I decided that retirement is not for me. My work: Studying the Tanya, reading Tehillim, praying daily with the Minyan, studying in the Kollel... I keep busy."
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Mishnah, Avos 5:21:
“Learn it and learn it, for everything is in it. Delve into it, grow old and gray over it, and do not stir from it, for there is nothing better for you than it.”

Credit: Yanky Ascher | Souls on the Don