1833 On 21 October, Thomas B Page was born in Clermont County, Ohio. [We seek a source, or correction, for this date]
1850 John Page (age 55) and Rachel Page (age 53) lived in Washington Twp, Clermont County, Ohio, with children Asahel Page (age 25), Mary Ann Page (age 21), Rebecca Page (age 19), Thomas B Page (age 17). 
1853 Thomas B Page, perhaps this one, was a representative from Darke County, Ohio at the Ohio State Teachers Association in Columbus Ohio. 
1854 On 24 August, Thomas B Page and Mary Ann Denniss were married in Clermont County, Ohio. 
1857 Thomas B Page of Laurel, Ohio patented an Improved Portable Field Fence, designed to stand vertically and firmly on unlevel ground. 
1860 Thomas B Page (age 27) and Mary A Page (age 24), lived with children Charles E Page (age 4) and Ash??? illegible (age 1), at Laurel post office, Monroe Twp, Clermont County, Ohio. Since this child was born the year Asahel Page died, it is possible that the child was named for Thomas' brother Asahel. Thomas was a music teacher with estate valued at $1700+$1000. 
1870 On 17 June, Thomas B Page, born Clermont County, Ohio, died on 17 June 1870 in Monroe Twp (also last place of residence), Clermont County, Ohio at age 37 years, 7 months, and 27 days. He was married and a farmer, cause of death liver disease. 
1870 On 17 June, Thomas B Page died at age 39 or age 37y 7m 28d in Washington/Monroe Twp, Clermont County, Ohio, perhaps due to fever. 
1870 On 20 October, Anna Page was born in Monroe Twp, Clermont County, Ohio to parents Thomas B Page and Mary A Dennis. 
1880 Widow Mary D Page (age 44, mother born in NJ) lived in Union Twp, Fayette County, Ohio with children Charles E (age 24), Ashel (age 21), John (age 17), and Anna (age 9). 
1910 Mary G Page widowed sister (age 75) lived in Greensburg, Decatur County, Indiana with widowed sister Martha J Cushman (age 72). Both were born in Ohio with father born Ohio and mother born New Jersey. Mary was a mother of 5, 3 living. This could be our Mary. 
1920 Sale Page (age 58) born Ohio lived in Springfield, Clark County, Ohio with wife Katie (age 58), son Harry W (age 29) and daughter-in-law Ethel (age 22). Widowed mother Mary Page (age 85) lived with them.
1861 Thomas B Page, perhaps this one, was a director of the Third National Bank, Cincinnati, Ohio. Thomas P Page was president. (advertisement in the Minutes of the Cincinnati Annual Conference of the Methodist Episcopal Church for the year ... page 151, by Methodist Episcopal Church Cincinnati Conference, Published by The Conference, 1861).
There was also a Thomas Page living in Cincinnati, with a different marriage record and death date.
1868 The death of Thomas B. Page on August 6 at age 44 was reported in the Cincinnati Daily Times and Daily Commercial. (wrong birthyear). 
A biographical sketch of son Charles E. Page reports: "Born in Clermont County, Ohio, June 19, 1855, our subject is the son of Thomas Page, likewise a native of Clermont County and an attorney by profession. His mother, Mary (Dennis) Page, is a sister of Dr. John F. Dennis, a prominent citizen of Washington C. H." 
 US census, 1850, Reel 0667, Image 515, family 780, [Internet_Archive].
 Ohio State Teacher's Association, The Ohio Journal of Education 3 (1854), 39, [Google_Book].
 FamilySearch.org, citing GS film 327561 of Clermont Marriage Records Book 6 page 173, license 750, [FamilySearch_Record].
 Report of the Commissioner of Patents for the year 1857 Vol. 3 [Congressional Edition, Volume 926; Volume 952] (1858), 102, No. 18,858, [Google_Book].
 US census, 1860
 FamilySearch.org, citing GS film 327596 of Ohio deaths, [FamilySearch_Record].
 Clermont County Death Record, page 42, image 56, [FamilySearch_Image].
 Clermont County, Ohio Death Records, image 58, [FamilySearch_Image].
 FamilySearch.org, citing GS film 327580 of Ohio births, [FamilySearch_Record].
 FamilySearch.org, US census, 1880, [FamilySearch_Record].
 FamilySearch.org, US census, 1910, [FamilySearch_Record].
 Jeffrey G. Herbert, Index of Death Notices Appearing in the Cincinnati Commercial, 1858-1899, Part 2:L-Z (Heritage Books, 1996), 444.
 Jeffrey G. Herbert, Index of Death Notices Appearing in the Cincinnati Daily Times, 1840-1879 (Heritage Books, 1994), 188.
 Portrait and Biographical Record of Fayette, Pickaway and Madison Counties, Ohio (Chicago: Chapman Brothers, 1893), 445, [Internet_Archive].