You say this now but if we ask you then, the day of your death, would you rather die now or live a few more years in a diminished capacity, you might have a very different answer.

Don't outsmart yourself.

If you told anyone, on their death bed, "if you had run 25 km a week since [n-15 years] you would have been able to move better / dance with pretty girls / play [tennis | golf | etc] until two years ago," I think most people would say WHY DIDN'T YOU TELL ME.

/Acey

But that’s not the trade off. Rather it’s “would you rather die now, or have lived in a diminished capacity for the last few decades?”