The census shows Sarah born bef. 1784, so her tombstone is probably a reflection of her fibbing about her age later in life.

  5.  Nancy STOKES, b. ca. 1809; m. John Murray HARRIS
  6.  Mary "Polly" STOKES, b. Jun 1811; m1. 6 Aug 1835, Todd Co., KY, Henry CLARK; m2. 18 Apr 1844, Todd Co., KY, Richard BOYD
  7.  Sarah Ann "Annie" STOKES, b. 14 Feb 1814
  8.  John STOKES, b. 22 Feb 1816
  9.  George STOKES, b. 11 Aug 1818

— born in Todd Co., KY:
10.  Jones STOKES, b. 11 Feb 1822
11.  Allen STOKES, b. 26 Apr 1824

1.  Jordan R. Dodd, ed.  1993.  KY, NC, TN, VA, WV Marriages:  Early to 1850.  Liahona Research, Orem, UT (Broderbund CD-229):  not found.

2.  Census Index:  U.S. Selected Counties, 1800 (Broderbund CD-312):  not found.

3.  Census Index:  U.S. Selected Counties, 1810 (Broderbund CD-313).  Please see my WARNING regarding use of this database (the numerical data have the genders switched). 

1810

Stokes, Mathew

KY

Christian Co.

p. 77

30010-2001000

These data should read:

20010-30010-00

which indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	9 or under	1800-1810	= Matthew = Son A
1 male	26-44	1765-1784	= Matthew (b. 1784)
3 females	9 or under	1800-1810	= Nancy (b. ca. 1809) = Daughter B = Daughter A
1 female	26-44	1765-1784	= Sarah (b. 1787?)

Other STOKES in county:  brothers John, Jones, and Young. 

4.  1820 Census Index/Images (online at Ancestry.com; Image #5 of 19; extracted by Diana Gale Matthiesen):

1820

KY

Todd Co.

p. 127/416

Ln. 6

Matthew Stokes

200010-21010-0-100

no slaves

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	9 or under	1810-1820	= George (b. 1818) = John (b. 1816)
1 male	26-44	1775-1794	= Matthew (b. 1784)
2 females	9 or under	1810-1820	= Sarah (b. 1814) = Mary (b. 1811)
1 female	10-15	1804-1810	= Nancy (b. ca. 1809)
1 female	26-44	1775-1794	= Sarah (b. 1787?)
1	person engaged in agriculture

Other STOKES in county:  brothers Jones and David. 

5.  Census Index:  U.S. Selected Counties, 1830 (Broderbund CD-315):

1830

Stokes, Mathew

KY

Todd Co.

p. 372

Other STOKES in county:  brothers Jones and Young; nephew Larkin; plus Armstrong. 

6.  Census Index:  U.S. Selected Counties, 1840 (Broderbund CD-316):

1840

Stokes, Mathew

KY

Todd Co.

Todd City

p. 268

Other STOKES in county:  nephew Larkin; plus Armstrong, George, and Polly. 

7.  1850 Census Index/Images (online at Ancestry.com; Image #19 of 100):  District No. 1, Todd Co., KY, p. 204A, 132/133, enumerated 29 Jul 1850 (extracted by Diana Gale Matthiesen):

Mathew Stokes	65	F (sic)	Farmer	350	NC
Sarah	63	F			Va

Listed next to son, Allen STOKES, two households from son, Jones STOKES, and four households from daughter, Anna (STOKES) HIGHTOWER.