Gerontology Research Group
The Gerontology Research Group (GRG) is a global organisation of researchers in various fields of gerontology, based in Los Angeles, California, that verifies and tracks supercentenarians (people who are at least 110 years old) and records a verified oldest people list. The group also aims to further gerontology research with a goal of slowing and reversing aging. History. The GRG was founded in 1990 by L. Stephen Coles and Stephen M. Kaye. The original chapter the LA-GRG, holds meetings each month though the organization has members worldwide who meet via online forums. The GRG verifies that  people claiming to be supercentenarians are at least 110 years old by validating proof-of-age documents provided by the claimant or their family. People claiming to be supercentenarians, or their family members, are required to supply documents that prove the claimant's birth date, change of name (if applicable), and date of death (if applicable), along with another piece of official government identification. Researchers from the GRG verify that these documents are true and correct and if they are, the claimant is included in the GRG's official tables of supercentenarians. The GRG also conducts research on aging by  interviewing supercentenarians and collecting blood and DNA samples. The GRG is recognized as an authority on supercentenarians by Guinness World Records and many other organizations. To 2015, the Gerontology Research Group found proofs of supercentenarian age for more than 1700 persons.