be set in your ways

be set in (one's) ways

To be inflexible or unwilling to change. Grandma will never retire—she's been a teacher for 50 years and is totally set in her ways. You'll never convince him to change, he's too set in his ways now.
See also: set, way

be ˌset in your ˈways

be unable or unwilling to change your behaviour, habits or ideas, usually because you are old: He’s too set in his ways now to think about a career change.
See also: set, way