Seems like either this is a couple of years old (Presenter states mark is 70) or his research is badly wrong!
I think it was recorded well before. It's more astonishing to me that pretty much every interview with Mark is a set of the same old questions and same old answers over and over again, each time I find something new is like a breath of fresh air to me. And it's not like Mark can't answer more questions, but nobody asks them.
But that's the price fans got to pay for Mark wanting to be away from the spotlight. Nobody's interested in his life as much as it deserves and of course, the chance that the interviewer would know more than a Wikipedia article is minuscule.