Starého psa novým trikom nenaučíš.
1. They say you can't teach an old dog new tricks, but I'm living proof. BNC
2. "You can't teach an old dog new tricks" means "I'm not going to change the way I do this." BNC
3. You`re never going to teach your father at the age of 79 to use a computer. You can`t teach an old dog new tricks, you know. CIDoI
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