age·ism 
/ˈeɪˌʤɪzəm/ noun
/ˈeɪˌʤɪzəm/ noun [noncount] : unfair treatment of old people
▪ He accused his former employer of ageism when he lost his job to a younger man.
▪ He accused his former employer of ageism when he lost his job to a younger man.
— age·ist /ˈeɪʤɪst/ adjective
▪ an ageist attitude/society
▪ an ageist attitude/society
