'antiager' is formed in modern English from the combining prefix 'anti-' (from Greek anti- meaning 'against' or 'opposed to') + 'age' (from Old French 'aage'/'âge') + the agentive suffix '-er' (forming nouns meaning 'one that does').

'antiager' derives from the marketing and medical compound 'anti-age' / 'anti-ageing' (attested in 20th century English), with the agentive suffix '-er' added in modern usage to denote either a product or person; the element 'age' itself came into English via Old French 'aage' (modern French 'âge') ultimately from Latin 'aetas'/'aetatem'.

Originally the prefix 'anti-' simply meant 'against' and 'age' referred to 'period of life'; in modern commercial and medical usage the combined form 'antiager' has come to mean a product or person intended to oppose or reduce the visible effects of aging.