An aged Scottish spinster cousin (who dressed like the Giles' cartoon of grandma) once said to me: 'You know, Eric, there is an old Japanese proverb which says: 'When your garden's complete, it's time to die.' That hit me hard at the time as my late wife, a keen gardener, had just been diagnosed with breast cancer.
When I had calmed down, I grasped it's profundity. One should never stop pursuing an aim. When one has no further aims in life, it really is time to die.
In similar vein, when I was a teenage paperboy delivering the morning papers, I read the headline in the Daily Mirror: SLEEP WITH BRENDA. It was the winning entry in a reader's challenge to identify what one would do if one was given the Four Minute Warning of nuclear armageddon from the newly opened Fylingdales Early Warning System. (In the nineteen-fisfties, one really did worry about nuclear incineration). Ever since, I have made a habit of asking myself what I would do if I knew that I had only four minutes left to live but a good fairy would grant me a final wish.
The point here is: if you know what you would wish to do in your last four minutes of life, why not do it now while there's plenty of time?