'longevity' originates from Latin, specifically the word 'longaevitas', where 'longus' meant 'long' and 'aevum' meant 'age'.

'longevity' changed from the Late Latin/Medieval Latin word 'longaevitas' (or 'longevitas') into Old French 'longevité' and eventually became the modern English word 'longevity' via Middle English.

Initially, it meant 'long age' or 'longness of life', and over time it evolved into the current general sense of 'long life' or 'long duration' applied to people, objects, and abstract things.