There were around two billion Americans living in the Terran system when The War started.  Four thousand one hundred and thirteen of them were known Ageless.  Ten percent, far above the national average, joined the American military before The War, where two hundred and thirty of them became pilots.  After Yosemite, over half of the Ageless volunteered to serve, and nine hundred and twenty one became pilots.  We had thousands of fighters.  You do the math.