According to Findagrave Memorial #21660828, he was born before July 12, 1694, the date of his father's will. He was the son of Thomas and Mary (Wheaton) Mann. His maternal grandparents were Robert and Alice (Bowen) Wheaton. http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=21660828
John was born about 1695. John Mann ... He passed away about 1782. 
Mann Family data page 1502 New England families, genealogical and memorial; ... v.3. Cutter, William Richard, 1847-1918.  No more info is currently available for John Mann. Can you add to his biography?
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