I have just added a copy of the will of John Allen of Swanzey, Colony of New Plymouth (Bristol Co.) (https://www.geni.com/documents/view?doc_id=6000000082539493143):
Will of John Allen of Swanzey in the Colony of New Plymouth in New England, "in ye eighty year of my age", dated 12 Mar 1689[/90].
Probate records 1687-1916, Bristol County, Massachusetts, Family History Library, film 461882, v. 1, p. 19-20.
Notice that he was in his 80th year in 12 March 1689/90 in the will, suggesting that he was born in about 1610. The date of the birth of John in this profile needs to be corrected, because it should be circa 1610, not 1604.