According to the IGI and Ancestral File at familysearch.org, Frank L Dow was born 17 Jun 1856 in Dover-Foxcroft, Piscataquis, Maine to Lorenzo G Dow & Maria A Haskell, married Lydia "Angie" Angelia Grant 3 Nov 1900, and died 27 May 1937.
Maine Marriage Records, 1892-1996: Frank L Dow married Angie L Grant both of Sebec on 3 Nov 1900.
1870 census of Dover, Piscataquis, Maine p30: Frank Dow, age 14, born in Dover, listed with parents, Lorenzo G, 42 & Maria A, 39 and siblings, Nellie, 13, John P, 10, George B, 6 and Lewis, 3 as well as Frank Sidelinger, 43.
1880 census of Sebec, Piscataquis, Maine p.106D: Frank L Dow, age 23, farmer, he & parents born in Maine, listed with siblings, Nellie A, 22, John P, 20, and George B, 15.
1900 census of Sebec, Piscataquis, Maine p1A-1B: Frank L Dow, age 43, born in Jun 1856 in Maine, parents born in Maine, farmer, listed with him is widowed housekeeper and future wife, Angie L Packard, 41 and her son, Fred A Packard, 9.
1920 census of Piscataquis County, Maine sheet 15: Frank Dow, age 60, he & parents born in Maine, single.