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citing Stiles' Ancient Windsor, 2:687 "(18 January 1655/[56]) … Mary 18 years."
"The last known record of Mary (Skinner) Colt is dated 14 July 1663, when Winthrop noted a prescription for 'Colt John at Hartford his wife.' She had died by the summer of 1665, when John married Hester Edwards, …"
"'Court record, … Page 83-18 January, 1655-6' is cited for the distribution of the estate."
This clarifies that the date Mary was 18 was 1655/56 (not 1654/55).