Bad record keeping in Hawaii in 1900-1910++? Bad record keeping and misregistering a 8 year old as 18 upon immigration to the territory of Hawaii? What are you proposing here?

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!?