Learner's definition of LONGEVITY
1 a : long life: the fact of living for many years b : length of life 2 : the length of time that something or someone lasts or continues
The longevity of a car's tires depends on how the car is driven.
She's a talented athlete, but many people have doubts about her longevity. [=about how long her athletic career will last]
They're trying to increase the product's longevity.