As someone dealing with a few cases of cancer in the family (including a child) I can’t help but think what an amazing miracle to live to 91 years old. Some people really hit the jackpot! Rest in peace.
When my younger sister was in elementary school, she complained to my mother that the other kids at school had grandparents.
A post a few years back by someone dying of a terminal disease said as much (and I will not forget the sentiment). Essentially: old age is a privilege, not something anyone should ever expect.