nonagenarian

/ˌnɒnæd͡ʒɛˈnɛːɹɪən/

noun

  1. 1

    One who is between the age of 90 and 99, inclusive. One who is in his or her tenth decade.

adjective

  1. 1

    Being between the ages of 90 and 99, inclusive. In one's tenth decade.

  2. 2

    Of or relating to a nonagenarian.

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