Thaddeus MacCarthy, Jr. - More research on the Thaddeus MacCarthys of Boston needed

Biographical information at this source http://archive.org/stream/mccarthysinearly1921obri#page/226/mode/2up/ on the various Thaddeus MacCarthys of Boston indicates the difficulty of telling them apart in the public records. The find a grave memorial for Thaddeus MacCarthy who married Mary Greenough and died in 1729 indicates a large age discrepancy between what the biographical information in the link above says and what is noted as being inscribed on the gravestone (34yrs, 6mos) http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=21484131 More research needs to be done to determine whether there has been a misreading of the headstone or confusion between multiple Thaddeus MacCarthys in the Boston area in the late 17th - early 18th centuries.