centenarian centenarian /ˌsɛntəˈnɛriːən/

adjective

1. Being at least 100 years old  ( centenarian )
   being at least 100 years old
   

noun

1. Someone who is at least 100 years old  ( centenarian )
   someone who is at least 100 years old
    The centenarian celebrated her 105th birthday surrounded by family.
   The centenarian celebrated her 105th birthday surrounded by family.