My grandparents are 91 and 87. My grandfather just knew he would die before he was 90 as his mom died just before she turned 90. My grandmother already thinks she has lived too long. It is really kind of sad, but she has had terrible arthritis for my entire life and her hands and feet are literally malformed now. I joke and say she is going to outlive us just so she can complain that we all left her.
In the meantime, I am so happy that my kids know their Mam and Pap and thoroughly enjoy their time with them.