Noun
length of days (uncountable)
(archaic) prolonged life; longevity
Without fullness of experience, length of days is nothing. When fullness of life has been achieved, shortness of days is nothing. That is perhaps why the young have usually so little fear of death; they live by intensities that the elderly have forgotten. Lewis Mumford
People in the world can never imagine the length of days to those in asylums. They seemed never ending, and we welcomed any event that might give us something to think about as well as talk of. Nellie Bly