nonagenarian
US /ˌnɑː.nə.dʒəˈner.i.ən/
UK /ˌnɑː.nə.dʒəˈner.i.ən/
1.
a person who is between 90 and 99 years old, inclusive.
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My grandmother, a proud nonagenarian, still enjoys gardening every day.
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The town celebrated its oldest resident, a lively nonagenarian who shared stories of the past century.
1.
of or relating to a person between 90 and 99 years old.
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The study focused on the health benefits of exercise for the nonagenarian population.
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She received a special award for her nonagenarian achievements in community service.