'age-resistant' originates from modern English compounding of 'age' and 'resistant'. 'age' originates from Old French 'age', ultimately from Latin 'aetās', where 'aet-' meant 'age' or 'time of life', and 'resistant' originates from Latin 'resistere', where 're-' meant 'back' or 'again' and 'sistere' meant 'to stand.'

'age' came into English via Old French 'age' from Latin 'aetās', and 'resistant' developed from Latin 'resistere' through Old French 'resister' and later English 'resist' plus the adjectival suffix '-ant', before being combined in modern English to form the compound 'age-resistant'.

Initially, elements meant 'period of life' for 'age' and 'to stand back' or 'withstand' for 'resistere'; over time they evolved into the modern sense of 'able to withstand the effects of aging', which is the current meaning of 'age-resistant'.