For some time now I have missed Grouchy and his QOTD. After some discussion, I am going to try and step into his (very large) shoes. Any assistance with good ones is gratefully appreciated.
This one has been attributed to a number of people. The earliest version I can find is from Otto Leupold Fürst vonBismarck:
“Der Mann, der kein Sozialist bei 20 ist, ohne Herz , aber, wenn noch ein Sozialist bei 30 er hat kein Gehirn”
(He who is not a socialist at 20 has no heart, but if he remains a socialist after 30 he has no brain)