Zohra Sehgal
From Tardis Wiki, the free Doctor Who reference
Zohra Sehgal (27 April 1912-10 July 2014[1]) played Sheyrah in the Doctor Who television story The Crusade. She had previously had an uncredited role as the attendant to Ping-Cho in Marco Polo. (DWM 240)
She was the second person associated with Doctor Who to reach the age of 100, after uncredited extra Lewis Alexander.
She passed away at 102 years old, making Olaf Pooley the oldest living Doctor Who actor until his passing in 2015. After her death, Sehgal remained the longest-lived Doctor Who actor until 2019, when she was surpassed by Earl Cameron.