longevity

noun

1. (countable, uncountable)The quality of being long-lasting, especially of life.

   “Grandpa had incredible longevity: he lived to be 105 years old!”

   “This 142-year-old tiny ex-LNWR SB [signal box, at Batley] is an amazing survivor, probably owing its longevity to its location alongside a level crossing. Indeed it started life as a gate box with the delightful name of Lady Ann's Crossing.”

   “The longevity of spicy and swicy will depend on how committed consumers are to sticking with these flavors as they grow older.”

2. (countable, uncountable)Duration over time; persistence.

   “A ‘postdating’ is an example of the use of a lexical item at a later date than currently recorded and these are important in establishing the longevity of use of a term and whether or not it has become obsolete.”