you can't teach an old dog new tricks
成語所屬單字teach
you can't teach an old dog new tricks — 慣用語
1. said when someone is too old or set in their ways to learn new skills or change
1.慣用語
釋義
老狗學不會新把戲；老人難以改變舊習慣
said when someone is too old or set in their ways to learn new skills or change their habits
例句
I tried to show my grandfather how to use the phone, but he said you cannot teach an old dog new tricks.