centenarian
US /ˌsen.t̬əˈner.i.ən/
UK /ˌsen.t̬əˈner.i.ən/
1.
a person who is 100 or more years old
:
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The village celebrated its oldest centenarian's birthday.
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She hopes to become a centenarian and live to see her great-grandchildren grow up.
1.
relating to or characteristic of a person who is 100 or more years old
:
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The study focused on the health of centenarian populations.
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She has a remarkably active centenarian lifestyle.