you cannot teach an old dog new tricks
you
ju
yoo
cannot
kænɒt
kānot
teach
ti:ʧ
tich
an
ən
ēn
old
əʊld
ewld
dog
dɒg
dog
new
nju:
nyoo
tricks
trɪks
triks
an old dog (will|shall) learn no tricks
an old dog (will|shall) not learn (any|) new tricks

Definition & Meaning of "you cannot teach an old dog new tricks"in English

you cannot teach an old dog new tricks
01

used to imply that older people are less adaptable to change and new ideas than younger people, as it is difficult or impossible to change someone's old behaviors or habits 

Proverb

What is the origin of the proverb "you cannot teach an old dog new tricks" and when to use it?

The origin of the proverb "you cannot teach an old dog new tricks" is difficult to pinpoint precisely, but it has been around for centuries. The phrase first appeared in a book on husbandry by John Fitzherbert published in 1534, and it has been widely used since then. It emphasizes the difficulty of changing long-established habits or thought patterns, implying that younger individuals are often more flexible and open to learning new things. While it can reflect a common belief about age and adaptability, it also highlights the challenges of overcoming deeply ingrained routines or perspectives.

Examples
I wish my boss would be more open to new ideas, but he's been doing things the same way for years. You know what they say, you cannot teach an old dog new tricks. 
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