Sonoma County to open vaccination sites at veteran's hall, local gyms Sonoma County opens vaccine eligibility to 70 and up Sonoma County has dropped its minimum age to receive the coronavirus vaccine to 70 years old. KTVU's Debora Villalon reports the county will soon have 19 vaccination centers. PETALUMA, Calif. - Sonoma County will open two new vaccination clinics this week, each aiming to administer 300 doses per day. This is also the first week of a lower age threshold, from 75 down to 70. "We know our oldest residents have suffered the worst outcome in this pandemic," Sonoma County Supervisor Susan Gorin said at a Monday afternoon briefing.