If you look back to the message list numbers 17 and 18 you can read John Montgomery’s own words regarding his service. This occurred in 1832 when he tried to get benefits approved by the Court. John Montgomery states his age as 68, so he was born in 1764. John Montgomery gives a full accounting of his military service before the Court.
I have no idea what color hair John’s relation Alexander Montgomery had. Eckert was not always 100% factual.
Kay