The actuary can tell you, statistically, when you will be called upon to release your hold on life. But then, the precise date is known only to the mirrors lining the hallways of our lives.

They say a man has measured time
Upon this blue-green Earth
A measured time that will begin
At squalling time of birth
But on reflection there is much
That each of us recalls
We see ourselves through shrouded eyes
In mirrors on the walls
That line the corridors of Time
Through which we wend our way
While knowing that the Time will come
But know not on which day
The mirrors in the corridors
Reflect what others see
Reflections that when once revealed
Remain the truth of thee
Until the measurement has run
Full course and at the last
We yield the scepter we once held
And present becomes past