You can't teach an old dog new tricks
bur. bɔjɔʃe bʰimɔɾɔti
In Bangla বুড়ো বয়সে ভীমরতি।
This idiom, while not a direct translation, conveys a similar meaning about the difficulty of changing established behaviors.
Example
"সে আর বদলাবে না, বুড়ো বয়সে ভীমরতি।"
