Had the character Joan Redfern been the creator, she would have been born about 1890, making her roughly 73 years-old.
In reality, much of the production of the first series was made by a select Committee of writers of the BBC in 1963. There is also some debate if the BBC Head of Drama, Sydney Newman, really came up with the idea, but it certainly wasn't the regular writer Terry Nation whose notable claim to fame was to create the Daleks.
Perhaps even more spooky is that in the episode you refer has Doctor Who referring to his parents as "Sydney and Verity", a fitting tribute to both Sydney Newman and the show's first producer Verity Lambert.
Therefore, the Question...
Did Sydney Newman Exterminate Joan Redfern?
