I have been reviewing the data referenced at the start of this FR webpage.
This list is 14,549 *elderly* voters, age 100 or greater, in the State of Michigan.
Up to this morning (20201111 Wednesday), I can confirm that 1,340 (at least) are deceased. (That “1,340” number may increase greatly, as I have another source/list to review.)
Of those 1,340 deceased (mentioned herein), 1,200 voted (their ballots were returned to the Michigan Sec’y of State) for the recent 2020 election.