You can’t teach an old dog new tricks

The idiom "You can't teach an old dog new tricks" means that it is often difficult to teach or change the habits or behavior of someone who is set in their ways or has been doing things a certain way for a long time. It suggests that older individuals or those who have established routines are less likely to be open to learning or adapting to new ideas or methods.
Here are a few examples to illustrate the usage of this idiom:
1. Example in a conversation:
Person A: "I've been trying to get my grandfather to start using a smartphone, but he refuses to learn."
Person B: "Well, you know what they say, you can't teach an old dog new tricks."
2. Example in a workplace setting:
Manager: "We are implementing a new software system, and I expect everyone to learn how to use it."
Employee: "I'm not sure if Mr. Johnson will be able to adapt. You can't teach an old dog new tricks, after all."
3. Example in a personal context:
Friend A: "I've been trying to convince my mom to try a new hobby, but she's not interested."
Friend B: "Sometimes, it's just hard to change someone's routine. You can't teach an old dog new tricks."
In all of these examples, the idiom is used to convey the idea that it can be challenging to teach or introduce something new to someone who is set in their ways or resistant to change.