Susannah was born in 1754. She passed away in 1833.
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVVX-L9SQ : 11 July 2016), Susannah Irvin Postlethwaite, 1833; Burial, , Mifflin, Pennsylvania, United States of America, Postlethwaite Cemetery; citing record ID 10870930, Find a Grave, http://www.findagrave.com.
Unsourced family tree handed down to Lawrence Santeford Ph.D..
https://www.geni.com/people/Susannah-Postlethwaite/6000000005234689121
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