"James Fenn s of Benjamin and Sarah (Baldwin) was born 14 May 1672 (Milford Vital Records), baptized 1672 (church record, First Congregational Society, Milford) and died 28 December 1746 ae 47 (gravestone)."
The date of death given by Mrs. Abbott is that of this man's son, also James, who was born in 1699. The elder James would have been ae 74 in 1746.