Here are some other things common to long-living people:
- They eat little or no breakfast
- They tend to get a good amount of exposure to the sun
- They don't eat industrial foods
- They're lean with little or no organ fat
- They have low fasting insulin levels
- They're fairly active, but not excessively so
- They have strong social and family bonds (but not social media)
- They eat organ meats and connective tissue, not just muscle meat
- They eat a fair amount of fish
- They eat fairly paleo
- They generally have healthy sleep patterns
- Their food tastes great and they enjoy eating it
- They're not posting on forums on a Saturday night
I'd say all of these (and more) are more important than worrying about macros or being "plant based". Also, IMO, it's surprising that the longest living people don't live substantially longer given everything they appear to be doing "right", which says to me that we need to do something in addition to what they're doing if we want to stay youthful and healthy. So even if your figures are correct (I don't think they are, at least for some regions like Okinawa) they are actually an argument for looking for something else to combat aging, which low-carb may partially do.