Sarah appears to have been fibbing about her age later in life.

1.  Marriage Record:

2.  1810 Census

3.  1820 Census Index and Digital Images (online at Ancestry.com; Image #3 of 7; extracted by Diana Gale Matthiesen):

1820

PA

Huntingdon Co.

West Twp.

p. 98

Caleb Corbin

300010-30001-0-100

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
3 males	9 or under	1810-1820	= Jacob (b. 1815) = Elijah (b. 1812) = Lewis (b. 1810)
1 male	26-44	1775-1794	= Caleb (b. 1785)
3 females	9 or under	1810-1820	= Sarah = Eleanor (b. 1819) = Adelia (b. 1813/4)
1 female	45 or over	in or bef. 1775	= Sarah (b. 1788)
1	person engaged in agriculture

Listed next to Ezekiel CORBIN, who is next to Nicodemus CORBIN, who is next to Abraham CORBIN.

4.  Census Index:  U.S. Selected Counties, 1830 (Broderbund CD-315):  not found.

5.  1840 Census Index and Digital Images (online at Ancestry.com; Image #7-8 of 10; extracted by Diana Gale Matthiesen):

1840

PA

Huntingdon Co.

Union Twp.

pp. 266B-267A

Calep Corbin

000 000 010 - 000 000 010

0100000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	50-59	1780-1790	= Caleb (b. 1785)
1 female	50-59	1780-1790	= Sarah (b. 1788)
1	person engaged in agriculture

6.  Census Microfilm Records:  Pennsylvania, 1850 (Broderbund CD-305, Disk 7; indexed as Caleb Carbin):  Millcreek Twp., Mercer Co., PA, Roll 796, p. 263B, 192/192, enumerated 31 Jul 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Caleb Corbin	64	M	Farmer	400	MD
Sarah    "	63	F			"
Delia    "	36	F			Pa
Benjamin "	10	M			"

Benjamin is most likely a grandchild.

7.  Broderbund.  World Family Trees.  Vol. 40, Pedigree No. 356.