non ‧ a ‧ ge ‧ nar ‧ i ‧ an /ˌnɒnədʒəˈneəriən, ˌnɒnədʒɪˈneəriən, ˌnəʊn- $ ˌnoʊnədʒəˈner-, ˌnɑːn-/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Language: Latin ; Origin: nonagenarius 'containing ninety' , from nonaginta 'ninety' ]
someone between 90 and 99 years old