Not treating the cancer is a personal decision only you can make. I only know of one person who, three years older than you, had hospice care and morphine or similar in the last few weeks.
A hospice nurse might be able to fill you in on how this would all go down.
We here on Connect try to encourage one another to fight and go on through recovery. As for me, if and when I am again faced with a reoccurrence, at my age, would I fight or not? I cannot say for certain either way.
As for you, I hope you give it a fight, best you can.