Estimated date of birth as between 1790 and 1796 is inferred from his being old enough to be co-executor of his father's will in Jan 1814, and being in the 40-49 age bracket in the 1840 census.

1840 census of Bethel twp, Clark Co., Ohio, lists:
Peter Minich, 3 m under 5, 1 5-9, 2 m 10-14, 1 m 40-49; 1 f 5-9, 1 f 10-14, 1 f 20-29, 1 f 30-39.