OAP
noun/ˌəʊ eɪ ˈpiː/
/ˌəʊ eɪ ˈpiː/
(British English, old-fashioned)- a person who receives a pension because they have reached a particular age (the abbreviation for old-age pensioner)
因达到特定年龄而领取养老金的人（老年养老金领取者的缩写）