Sure, but there would have still been the same poor record keeping around birth dates and the same incentives for people in a poor area 60 years ago to enter the workforce early.
I'm looking at a photograph I have with a 1915-2015 and in same frame an immediately adjacent plot for a distinct family which has 1913-2015, both of these deceased almost certainly born in the territory of Hawaii (one site has two 1880s born -- that's probably the immigrants).
Supposing there were bad records and incentives to fudge that persisted into the territory of Hawaii, why would those incentives only exist for Okinawan immigrants in Japan versus immigrants from any other prefecture, including poor ones like those in the south of Honshu or Kyushu!?