oc·to·ge·nar·i·an /ˌɑktəʤəˈnɛriən/ (a.)八十歲的,八十多歲的八十歲,八十多歲
Oc·to·ge·na·ri·an n. A person eighty years, or more, of age. ◄ ►
octogenarian adj : being from 80 to 89 years old n : someone whose age is in the eighties