Old habits die hard is used to say that making people change their attitudes or behavior is difficult.

e.g.,  She knew it probably wasn’t necessary anymore, but old habits die hard.

I have been going for a walk in the mornings for the last 10 years, but now that my doctor has asked me to rest, I still can’t stop. I’m so used to it. Old habits die hard; I can’t stop.

Tradução: É difícil mudar velhos hábitos.