octogenarian

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US /ˌɑːk.toʊ.dʒəˈner.i.ən/ 
UK /ˌɒk.təʊ.dʒəˈneə.ri.ən/ 

Longman Dictionary of Contemporary English

octogenarian

octogenarian /ˌɒktəʊdʒəˈneəriən, ˌɒktəʊdʒɪˈneəriən, -tə- $ ˌɑːktoʊ-/ BrE AmE noun [countable]
[Date: 1800-1900; Language: Latin; Origin: octogenarius 'containing eighty', from octoginta 'eighty']
someone who is between 80 and 89 years old

Oxford Advanced Learner's Dictionary

octogenarian

oc·to·gen·ar·ian [octogenarian octogenarians]   [ˌɒktədʒəˈneəriən]    [ˌɑːktədʒəˈneriən]  noun
a person between 80 and 89 years old 
Word Origin:

early 19th cent.: from Latin octogenarius (based on octoginta ‘eighty’) + -an.

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

octogenarian / ˌɒk.təʊ.dʒəˈneə.ri.ən /   / ˌɑːk.toʊ.dʒɪˈner.i- / noun [ C ]

a person who is between 80 and 89 years old

© Cambridge University Press 2013

Collins Advanced Learner’s English Dictionary

octogenarian

/ɒktoʊdʒɪneəriən/
(octogenarians)

An octogenarian is a person who is between eighty and eighty-nine years old.

N-COUNT

Merriam-Webster's Advanced Learner's Dictionary

octogenarian

oc·to·ge·nar·i·an /ˌɑːktəʤəˈnerijən/ noun, pl -ans [count] : a person who is between 80 and 89 years old