octogenarian in British English
(ˌɒktəʊdʒɪˈnɛərɪən) or less commonly octogenary (ɒkˈtɒdʒɪnərɪ)
nounWord forms: plural -narians or -naries1. a person who is from 80 to 89 years old
adjective2. of or relating to an octogenarian
Word origin
C19: from Latin
octōgēnārius containing eighty, from
octōgēnī eighty each