Birth date of Rev. Michael Zehr

I just recently obtained the ship's manifest of the Barque Stratera, which landed June 19, 1833 in New York harbor. It lists Michael Zehr as age 44 at that date. This would equate to a birth year of 1788, if the date of September 29 is correct. The Farney, Virkler, Zehr genealogy lists his birth date as 1789. Any other information out there?

Further, his obituary lists him as 90 years of age in Feb, 1880, which argues for a Sep 1789 birth date.

It was the Lowville Journal and Republican, March 19, 1925, in its "45 years ago" section, that listed his age as 90 at death. The 1880 Carthage Republican that reported his death listed him as 89.

The "History of the Conservative Mennonite Conference, 1910-1985", by I.J. Miller, lists his age at death on Feb 27, 1880 as 94.

"A history of the Amish", by Steven M. Nolt, lists Bishop Michael Zehr as having lived "1790-1880".

Not sure of the source of the following, located at diannebauer.com:

"Feb. 27th, at Crogan, Lewis Co., N. Y., of the Amish Men. church, Bishop MICHAEL ZEHR, at the advanced age of 89 years, 4 months and 27 days. He had 9 children, 170 grand and great-grand-children. His wife was called away many years since. He was a good man, whose hand was ever open for the poor. In his office he was a good counsellor, and was beloved by all who had the pleasure of his acquaintance. On the funeral occasion words of comfort were delivered by Peter Lemon and Jacob Vogt. The labours of our brother are ended on this earth, and he has gone to the reward of the righteous."

If my math is right, this would have given him a birth date of Sep 30, 1790.

The last one was from the Gospel Herald, which can be found here: http://www.mcusa-archives.org/mennobits/1880/apr1880.html