I got roughly 379 people, using current world population (http://www.worldometers.info/world-population/) and not including your last step of factoring out kids and elderly, because that should have been done in the (1 in 1k capable) step.
With all due respect, React and Redux are still "in" and one of those buzz word frameworks right now. Your sentiment would mean a lot more if you were still having success with something like Angular 1.
You aren't proving you are resilient to changes by using one of the most current buzz-word filled frameworks out there for two years. The real test happens when your framework of choice truly becomes obsolete, like with what happened to Angular 1.