She had a pause between age 15 (which would be 1940) and 1951. So, 82 years, I guess? Damn impressive indeed, although I'm more impressed by how she looks 15 years younger than she actually is. I would not have taken her for a 97 year old woman.
[Edit: Dear downvoters, I’m not seriously complaining about this. But the GP post used the words “I’m more impressed by…” — and you have to admit, it’s pretty ironic that, in the literal end, people are more impressed by a random genetic trait than the art on which you spent 93 years.]