Griffith (Forgotten Lives)

From Tardis Wiki, the free Doctor Who reference

Mr Griffith was a resident at Bryn Offa Residential Home. Born circa 1923, he suffered from dementia and suffered five heart attacks. In 2016, he had his mind swapped with Jack Harkness, who had Gwen Cooper use a bio-stabiliser on him. Jack said that Mr Griffith might live to the age of 150. (AUDIO: Forgotten Lives)