εὔγηρως

From LSJ

ὃν οὐ τύπτει λόγος οὐδὲ ῥάβδος → if words don't get through, neither a beating will | if the carrot doesn't work, the stick will not work either | whom words do not strike, neither does the rod

Source

French (Bailly abrégé)

ως, ων;
qui jouit d'une belle vieillesse.
Étymologie: εὖ, γῆρας.