

I thought about it for a second, and my mental idea of what a normal person is is like some black and white nuclear family, white dad with slick back hair and a sweater and a pipe in his mouth, and wife wearing a gingham dress, cooking food and cleaning with her hair in an updo.
If that is what normal is, there’s only ever been one family that was actually normal, and they are all dead now.
I think that saying comes from an era when that’s what happened to them.
That aside, it really depends on the person. Just because some people get a little more flexible in some ways doesn’t mean that everyone becomes more flexible as they age. It’s very likely that people can get more and more set in their ways as time goes by.