When could an 18 year old vote for president in Michigan?

An 18-year-old could vote for president in Michigan if they turn 18 on or before Election Day. In the U.S., the minimum voting age is 18, and Michigan allows individuals to register to vote at 17 years and 4 months, as long as they will be 18 by the time of the election. Therefore, as long as they meet these criteria, they can participate in the presidential election.