Charles is not listed in McBrides' cemetery book, 1972 edition, so there may be no legible tombstone. The source saying that he is buried in Pleasant Hill Cemetery is https://familysearch.org/ark:/61903/2:1:MWW8-TC8 (and it makes sense because of his residence in the vicinity and burials of his close family members in the same cemetery).

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Charles M. Bentley
mentioned in the record of Charles M. Bentley and Margaret Ann Dorsey
Name Charles M. Bentley
Spouse's Name Margaret Ann Dorsey
Event Date 12 May 1828
Event Place Highland,Ohio

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Charles M Bentley
United States Census, 1830
Name Charles M Bentley
Event Place Leesburg, Highland, Ohio
Page Number 70

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Charles Bentley
United States Census, 1840
Name Charles Bentley
Event Place Leesburg, Highland, Ohio
Page Number 11

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Charles M Bentley in the 1850 United States Federal Census
Name: Charles M Bentley
Age: 41
Birth Year: abt 1809
Birthplace: Virginia
Home in 1850: Fairfield, Highland, Ohio, USA
Gender: Male
Family Number: 820
Household Members:
Name Age
Charles M Bentley 41
Margaret A Bentley 38
Sarah B Bentley 15
Wm G Bentley 13
Matilda D Bentley 11
John H Bentley 7
Richard O Bentley 4
Ann M Bentley 1

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Charles M Bently in the 1860 United States Federal Census
Name: Charles M Bently
Age: 53
Birth Year: abt 1807
Gender: Male
Birth Place: Virginia
Home in 1860: Fairfield, Highland, Ohio
Post Office: Leesburg
Family Number: 1775
Value of Real Estate: View image
Household Members:
Name Age
Charles M Bently 53
Margaret Bently 51
William Bently 24
John Bently 18
Otho Bently 16
Ann Bently 10
Mary Bently 8
Charles Bently 2

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Charles Bently
United States Census, 1870
Name Charles Bently
Event Type Census
Event Year 1870
Event Place Ohio, United States
Gender Male
Age 63
Race White
Race (Original) W
Birth Year (Estimated) 1806-1807
Birthplace Virginia
Page Number 30
Charles Bently M 63 Virginia
Margaret Bently F 57 Maryland
John Bently M 27 Ohio
Otho Bently M 26 Ohio
Mary Bently F 19 Ohio
Charles Bently M 14 Ohio

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Charles Bentley in the 1880 United States Federal Census
Name: Charles Bentley
Age: 74
Birth Year: abt 1806
Birthplace: Virginia
Home in 1880: Fairfield, Highland, Ohio
Race: White
Gender: Male
Relation to Head of House: Self (Head)
Marital Status: Married
Spouse's Name: Margret Bentley
Father's Birthplace: Virginia
Mother's Birthplace: Virginia
Occupation: Blacksmith
Name Age
Charles Bentley 74
Margret Bentley 67
Otho Bentley 33
Mary Bentley 24

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Working list of children, with approx yrs of birth based on census listings:

Sarah, 1835 (link requested 8/13/15)
William G., 1837 (linked below)
Matilda, 1839 (linked below)
John H., 1843 (link requested 8/13/15)
Richard Otho, 1846
Ann M., 1848 (linked below)
Mary, 1852
Charles, 1856-1858