Joseph was born about 1785. He passed away in 1853. Parentage listed is from Find a Grave, and may be related but improbable as parents.
Research Note:
Seems unlikely this is a son of Joseph and Elizabeth Erwin due to birthdate. Their daughter Mary Erwin Lochry Guthrie was born 1755. More like this was a grandson and a generation is missing. Possibly the Joseph Erwin son of Captain Joseph Erwin was among the survivors of Lochry’s massacre in 1781. Paula Thayer . Remove when resolved.
Sources
"United States Census, 1830," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHPK-5P7 : 20 February 2021), Joseph Irwin, Washington, Westmoreland, Pennsylvania, United States; citing 228, NARA microfilm publication M19, (Washington D.C.: National Archives and Records Administration, n.d.), roll 164; FHL microfilm 20,638.
"United States Census, 1840," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XHB7-G71 : 10 June 2022), Joseph Irvin, Washington Parish, Westmoreland, Pennsylvania, United States; citing p. 144, NARA microfilm publication , (Washington D.C.: National Archives and Records Administration, n.d.), roll ; FHL microfilm .
"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M4Z4-5MN : 24 December 2020), Joseph Irwin, Washington Parish, Westmoreland, Pennsylvania, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
Find a Grave, database and images (https://www.findagrave.com/memorial/206809662/joseph-erwin_irwin: accessed 9 February 2023), memorial page for Joseph Erwin/ Irwin (1785–30 Sep 1853), Find a Grave Memorial ID 206809662, citing Poke Run Church Cemetery, Poke Run, Westmoreland County, Pennsylvania, USA; Maintained by Margaret (Stivenson) Krecota (contributor 49238833).
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DNA Connections
It may be possible to confirm family relationships with Joseph by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: