Sorry about your Grandmother's situation but you won't off yourself when you get old. When you are near death, and without terminal disease -- you'll cling on because what little is left will seem precious to you unless you are Alzheimer's demented then it won't matter much.

Being a vegetable at life's end is the real issue -- Dr. Kevorkian's prison sentence settled that. However, if the state denies you a dignified self-inflicted death they should pay the end game cost willingly.