You can't teach an old dog new tricks
stɑrʌvʌ psɑ novym fokusʌm nʲe nautʃʲiʃ
In Russian Старого пса новым фокусам не научишь.
This idiom is a direct translation and is commonly used in Russian culture.
Example
"Он не хочет учиться новому, старого пса новым фокусам не научишь."
