A friend of mine, well into her 80's, has grey hair long enough to sit on. It's very thick and shiny, she always wears it up in a bun. Her late husband liked her hair long so she never cut it. During a hospital stay last year, the hospital hairdresser refused to do anything with her hair because it was so long and kept insisting she should cut it.
My own grey hair grew from very short to shoulder length during the lockdowns. It's now a chin length bob and very easy to manage. I had very long hair in my youth and well remember dashing off to work in the mornings with wet hair hanging down my back! I was never one for 'fiddling' with my hair and doing up-styles, so eventually it was for the chop. I went from waist length to a Mia Farrow crop in one day. Oh the liberation!
If a woman is happy with her long hair and can manage it easily then she shouldn't feel she should conform to other people's ideas of the older woman. Love you tresses ladies!