It appears Mary's birth and death dates may be from a tombstone, which may have been misread (viz., a 3 for an 8) — or, as most women did, she was fibbing about her age by mid-life and that left the person ordering the tombstone misinformed.

— born in Indiana, presumably Huntington Co.:
11.  Lydia CUPP, b. Jul 1850

1.  Marriage Index:  Indiana, 1851-1900 (Broderbund CD-243):

Curuston, William

Capp, Sarah Ann

Oct 23, 1859

Huntington Co.

2.  1830 Census Index and Digital Images (online at Ancestry.com; Image #7 of 20; extracted by Diana Gale Matthiesen):¤•

1830

OH

Perry Co.

Thorn Twp.

p. 419

Ln. 4

Daniel Cupp

000 010 - 200 010

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	20-29	1800-1810	= Daniel (b. 1801)
2 females	4 or under	1825-1830	= Elizabeth (b. 1829/30) = Daughter A
1 female	20-29	1800-1810	= Mary (b. 1802/3)

Listed three lines above Daniel's brother, John CUPP. 

3.  1840 Census Index and Digital Images (online at Ancestry.com; Image #15-16 of 20; extracted by Diana Gale Matthiesen):¤•

1840

OH

Perry Co.

Thorn Twp.

pp. 63B/64A

Ln. 10

Daniel Cupp

210 011 - 122 001

0002000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	4 or under	1835-1840	= Allen (b. 1839) = Valentine (b. 1837/8)
1 male	5-9	1830-1835	= William (b. 1830/1)
1 male	20-29	1810-1820	= ?
1 male	30-39	1800-1810	= Daniel (b. 1801)
1 female	4 or under	1835-1840	= Sarah (b. 1835/6)
2 females	5-9	1830-1835	= Rebecca (b. 1834/5) = Daughter B
2 females	10-14	1825-1830	= Elizabeth (b. 1829/30) = Daughter A
1 female	30-39	1800-1810	= Mary (b. 1802/3)
2	persons engaged in manufactures and trades

4.  1850 Census Index/Images (online at Ancestry.com; Image #149 of 193):  District No. Fifty-Two, Huntington Co., IN, pp. 74A-74B, 1042/1042, enumerated 26 Sep 1850, official enumeraton date 1 Jun 1850 (extracted by Diana Gale Matthiesen):•

Daniel Cupp	49	m	Farmer	3500	Virginia
Mary      "	46	f			Ohio
Elizabeth "	20	f			Ohio
William   "	19	m			Ohio
Rebecca   "	15	f			Ohio
[next page]
Sarah A. Cupp	14	f			Ohio
Valentine "	12	m			Ohio
Allen     "	11	m			Ohio
Susanna   "	8	f			Ohio
Urias     "	4	m			Ohio
Lydia     "	2/12	f			Indiana
George W. Mann	26	m	Farmer	400	Pennsylvania
Catharine M. "	32	f			Ohio

This is the only CUPP household in Huntington Co.

5a.  Census Records, Indiana, 1860 (Broderbund CD-304 — this CD is an extraction, not page images):  Huntington P.O., Rock Creek Twp., Huntington Co., IN, p. 158.  There is some kind of mixup on the CD because Daniel and Mary are given the same family number (1086), but different dwelling numbers (1084 and 1085, respectively).  "Y" and "N" answer the question:  Head of household?  No one else is listed with these dwelling or family numbers, but see next source.

39A	1084	1086	Y	Cupp, Daniel	M	58	W	Farmer	$8000	$800	Virginia
40A	1085	1086	N	Cupp, Mary	F	57	W				Ohio

5b.  1860 Census Images (online at Ancestry.com; Image #158 of 385):  Huntington P.O., Rock Creek Twp., Huntington Co., IN, p. 158, PN 158, enumerated 14 Jul 1860 (extracted by Diana Gale Matthiesen):•

1085	1086	David Cupp	58	M		Farmer	8000	800	Virginia
		Mary   "	57	F					Ohio
[next page]
"	"	William Cupp	27	M		Farmer			Ohio
		Valentine "	23	M		Carpenter			"
		Allen     "	20	M					"
		Susanah   "	18	F					"
		Uriah     "	15	M					"
		Lydia     "	10	F					Indiana
		David Miller	5	M					"
		Ephraim Hartman	24	M		Farm Laborer			Ohio

6.  1870 Census.

7.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).

8.  LDS.  Family Search: Internet Genealogy Service: International Genealogical Index (IGI).

George MANN Spouse: Catherine RHODES Marriage: 16 Jan 1842, Franklin, Ohio Source: Marriage records, 1803-1951... Ohio. Probate Court (Franklin County)

Is this couple the one living with our subjects in Indiana in 1850?