My grandmother lived to her mid 90’s. Said the same thing more or less, that it was distressing that her body couldn’t keep up with her mind. She never lost a beat, mentally. Many things she did over her life, and wanted to do, but her body just couldn’t do it. That must be very depressing to the soul. And, you outlive just about every friend and neighbor you made over a lifetime. My missus became a great friend to her, took her to lunches and drove her places to take photographs - taught her how to use photoshop of all things to edit her photographs. And they were 2 generations apart. Hard to make new friends especially generations younger than you and when it’s hard to get around.
That was specifically mentioned by my grandma. She outlived all of her siblings and in-laws, all of her childhood and adult friends, her husband, one son and one grandson. Despite all her surviving children, grandchildren and great-grandchildren, she missed those who had passed on before her. There was no one left to share memories of the old days with.