Maybe. But if anybody had empirical data on old people, I would expect it to be the SSA.
I'd point out that one would expect the SSA tables to overstate the number of centenarians etc, for the simple reason that they are linked to financial payments/checks. Japan recently had some interesting reports that its centenarian numbers were overstated... because other people were collecting their pension checks. From the BBC:
...More than 230,000 elderly people in Japan who are listed as being aged 100 or over are unaccounted for, officials said following a nationwide inquiry. An audit of family registries was launched last month after the remains of t
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.