You cannot teach an old dog new tricks

you can't teach an old dog new tricks

You can't teach someone who is set in their ways to change their behavior. Good luck getting grandpa to start going to yoga with you. You can't teach an old dog new tricks.
See also: dog, new, old, teach, trick

You cannot teach an old dog new tricks.

Prov. Someone who is used to doing things a certain way cannot change. (Usually not polite to say about the person you are talking to; you can say it about yourself or about a third person.) I've been away from school for fifteen years; I can't go back to college now. You can't teach an old dog new tricks. Kevin's doctor told him not to eat starchy food anymore, but Kevin still has potatoes with every meal. I guess you can't teach an old dog new tricks.
See also: cannot, dog, new, old, teach, trick
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WHOEVER said you cannot teach an old dog new tricks had not reckoned on Steve Simonsen.
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