âGov. Gretchen Whitmer and Michigan Department of Health and Human Services (MDHHS) officials announced Wednesday, Jan. 3, that the state is moving to a new phase of vaccination Monday, Jan. 11. âMDHHS is moving forward with vaccination of Michiganders age 65 and older; frontline essential workers including police officers, first responders, frontline state and federal workers and jail and prison staff; and preK-12 teachers and childcare providers. âTo date, 80 percent of deaths have occurred among those age 65 and older. In addition to vaccinating Michiganders who are 75+ in Phase 1B (Phase 1B, Group A), MDHHS is accelerating to vaccinate individuals 65-74 years old (Phase 1C Group A). MDHHS is accelerating implementation of vaccination of individuals 65-74 years due to concern around disparity in life expectancy by race/ethnicity for this group (Phase 1C, Group A).