I planned to be dead at 53, but I'm almost 58. NO Neurologist will answer this or even, a way more practical question, "what are the illnesses I need to prepare for". At least in the USA where all decisions are based on paranoia of being sued.
Some ways I can see that I have a much greater chance of dying are
--esophagus cancer
--stomach cancer
--intestinal cancer
--intestinal blockage
--stomach blockage (or starvation via)
The less stress you have, the healthier your diet, the more loving companions you have and the better climate you live in, the longer you will live. People who have a positive biopsy should plan their end years, NOW so that you can have less stress.