[English idiom // angielski idiom]
A/ I'm going to start parachuting. Wouldn't you like to join me? B/ Come on! YOU CAN'T TEACH AN OLD DOG NEW TRICKS and I'm like an old dog when it comes to all sorts of extreme sports!
When you say you can't teach an old dog new tricks, it means that it's very difficult to make someone older learn something new.
Do you think this idiom is true?