California expands vaccine eligibility to another 4.4 million residents: What you need to know California expands vaccine eligibility to another 4.4 million residents, here’s what you need to know California on Monday expanded the list of people eligible for the coronavirus vaccine by another 4.4 million people. Here's everything you need to know. LOS ANGELES - An estimated 4.4 million Californians with certain high-risk medical conditions or disabilities became eligible for the vaccine on Monday, March 15. People ages 16-64 can be eligible if they are deemed to be at the very highest risk to get very sick from COVID-19. Cancer, current with a weakened immune system