You can't teach an old dog new tricks

Cultural  

1. People who have long been used to doing things in a particular way will not abandon their habits. (Compare It's never too late to mend.)

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Example Sentences

They say you can’t teach an old dog new tricks.

From Washington Post

“Another driver in the series told me, ‘You can’t teach an old dog new tricks,’ and that’s kind of been his reputation his whole career in Europe,” Rahal said.

From Seattle Times

“As another driver in the series told me, ‘You can’t teach an old dog new tricks,’ and he’s had this reputation his whole career in Europe and we’re learning his reputation quickly here,” Rahal said.

From Seattle Times

You might save yourself some unpleasantness if you keep in mind the old maxim that you can’t teach an old dog new tricks.

From Scientific American

The old adage that you can’t teach an old dog new tricks doesn’t apply in Wilfert’s case.

From Seattle Times