I already am in the "late in life" stage. A long time ago I was warned of what I should beware of, just to be on the safe side and without any guarantees on the part of science. Because of genetic reasons, I had a predisposition to contract cancer, arthritis, arthrosis, Alzheimer's, have a serious heart condition, suffer from mild to severe CVAs, and from retinal artery occlusion. Extremely encouraging, wouldn't you say?
If I had guided my life by these warnings, I would probably have become a recluse and taken to a wheelchair in my early youth. Instead, I stuck to my belief that what will be will be, and led an adventurous, fulfilling life. This doesn't mean that I crossed the road against the traffic lights. I just took simple precautions that didn't interfere with the things I loved doing.
So far, the prognosis has failed altogether. This does not mean that I cannot die of a heart attack as I'm writing this. But if I do, I will have enjoyed my life without self-imposed restrictions dictated by fear. Would I like to know now, in the eve of my life, which of the old predictions or new ailments can hit me? No. I'll fight them if there's hope to defeat them, or I'll make the most of my time as the end comes.
I wouldn't like to plan the end. Life has been an inexhaustible source of surprises to me, not always good, I must admit, but always educational. In my philosophy, decay and death are only a natural part of life. I'd love to skip the decay step, but the choice is not up to me.