My family came to a different result for somebody the same age.
We looked at it from the standpoint of, "With blood cancer in their 80s, is there an endgame that resulted in getting better?"
If you think about it for a minute, you don't get better in your 80s in a meaningful way, since you aren't going to live forever.
So we asked them what their wishes were, and did not continue treatment. Everybody reached an agreement that wasn't all about the emotions of people who weren't ill.