Gerontology Wiki

Not to be confused with Mary Weir.

Mary Keir
Mary Keir
Birth: 3 March 1912
St Davids, Pembrokeshire, Wales, UK
Age: 110 years, 158 days
Country: United Kingdom UK

Mary Letitia Keir (born 3 March 1912) is a British supercentenarian who was the oldest known person to receive the COVID-19 vaccine until various older people were vaccinated in later days. She is currently the oldest known person living in Wales. Her age is currently unvalidated by the Gerontology Research Group (GRG).


Mary Keir was born in St Davids, Pembrokeshire, Wales, UK on 3 March 1912. She later lived in Llansteffan, Carmarthenshire, Wales. She worked as a ward sister at Llandough Hospital in Penarth, Wales.

In either 2011 or 2012, Kier moved into a care home in Llandeilo, Carmarthenshire, Wales. Coincidentally, another supercentenarian Gwenllian Davies (1905–2016) was also a resident of the same home. On 17 December 2020 at 2.30pm, Keir received her first dose of the Pfizer/BionTech vaccine, making her one of the first care home residents in Wales to be vaccinated against COVID-19.

Keir became the oldest known living person in Wales, following the death of 110-year-old Amy Hawkins on 9 September 2021, as well as the oldest known living person born in Wales, following the death of Mollie Walker on 22 January 2022.

In March 2022, Keir celebrated her 110th birthday. She is currently the seventh-oldest known living person in the United Kingdom, behind Ethel Caterham, Rose Eaton, Ada Thompson, Edna Strickland, Gladys Cloke, and Mary Florence Walker.