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holdover
(North American) a person or thing surviving from an earlier time, especially someone surviving in office or remaining on a sports team.
@Acer
Centenarian::
A centenarian is a person who has reached the age of 100 years. Because life expectancies worldwide are below 100 years, the term is invariably associated with longevity.
Veteran::
a person who has had long experience in a particular field.
Greybeard::
greybeard (plural greybeards) An old man. (figuratively) Any of the members of a group who have been there the longest, often implying experience.