This is a quick one.
Nobody is ever too old to change.
Nobody is ever too entrenched in their ways to change.
Nobody is ever incapable of change.
Whether a person is ten or twenty or thirty or forty or fifty or sixty or seventy or eighty or ninety or one hundred, he or she or they have the ability to change.
If they want to.
You will never force anyone to do anything.
Can you teach an old dog new tricks?
Sure you can.
As long as the desire for change is coming from the dog.
And not from you.