no·na·ge·nar·i·an /ˌnonəʤəˈnɛriən, ˌnɑ-/
(a.)九十多歲的九十多歲
Non·a·ge·na·ri·an n. A person ninety years old.
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nonagenarian
adj : being from 90 to 99 years old; "the nonagenarian inhabitants
of the nursing home"
n : someone whose age is in the nineties