Birth month & year calculated from age (5/12) in the 1870 census enumerated 29 June 1870.
Sources
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MX75-7FG : 17 October 2014), Allen Colley, Kentucky, United States; citing p. 26, family 175, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,953.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8SG-45Y : 15 July 2016), Allen Colley in household of Allen Colley, Morgan, Scioto, Ohio, United States; citing enumeration district ED 167, sheet 134A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1064; FHL microfilm 1,255,064.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KWLW-7G1 : 1 December 2019), Allen Colley, Camp Creek Township, Pike, Ohio, United States; citing enumeration district (ED) 66-4, sheet 6A, line 41, family 92, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3129.
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DNA Connections
It may be possible to confirm family relationships with Allen by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Allen: