You-Can't-Teach-An-Old-Dog-New-Tricks

In English: You can't teach an old dog new tricks.

In French: Ce n’est pas à un vieux singe qu’on apprend à faire la grimace. -- You can’t teach old monkeys how to make faces.=You can't teach old dog new tricks.

In Portuguese: Burro velho não aprende línguas. (An old donkey doesn't learn new languages.)

In Spanish: El zorro cambia el pelo pero no las mañas.???

El diablo sabe por diablo, pero más sabe por viejo. ???

In Russian: Старых собак новым трюкам не научишь.