And he wasn’t even on Rapamycin. If he were he could possibly live even longer.
I wonder, now that there are a decent number of dogs taking rapamycin, I wonder how long it will be before one breaks the record?
I’d guess less than 31 years from now. 
The dog aging scientists have called “bullshit” on these large, older dog cases: Dog Rejuvenation Olympics - #2 by RapAdmin
Just as there is a long history of people exaggerating their lifespans, so it is with dogs:
All of this means that it’s near impossible to accurately assess a dog’s age once they get past a certain age. Even though Allum estimates the age of dogs as part of her day job, she still says that it comes down to a well-informed “best guess” when she has to put an age down in the medical records of a stray dog.
The only way to be sure of a pooch’s provenance is to have a record of them since their birth, or at least since they were a puppy. In the UK, dogs must be fitted with a microchip that contains a unique identifier before they are eight weeks old. A combination of microchip records and photos that show a dog aging over the years would be the most reliable indicator of a dog’s true age, Allum says, although she notes that even those records could be falsified.
Full article: https://archive.ph/rhWm8
My dog, a chi, 19 years old, died. She was on rapamycin once a month dose. I think she died of a stroke (looked like that, but wasn’t diagnosed).
Is 19 long life for Chi, or is it normal?
It’s a little longer than normal. Small dogs live longer. She was healthy and active even 6 mo ago. Then suddenly within a week she became deaf and blind (cataracts grew very fast).