1.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org).

Philander HOPKINS Spouse: Emeline EGLESTON Marriage: About 04 Jan 1860, , Washtenaw, Michigan Source: Marriage Records, 1827-1922. Washtenaw County (Michigan). County Clerk

John Nelson CULVER; Age: 49 Spouse: Maria Annette EGGLESTON; Age: 37 Marriage: 27 Jun 1867, , Washtenaw, Michigan Source: Marriage Records, 1827-1922. Washtenaw County (Michigan). County Clerk

Philander HOPKINS; Birth: , Niagara, NY; Age: 49 Spouse: Maria Annette CULVER or EGGLESTON; Birth: , Onondaga, NY; Age: 55 Marriage: 11 Apr 1886, Ingham, Michigan Source: Record of Marriages, 1838-1917. Ingham County (Michigan). County Clerk

It does not make sense to me that a county marriage date would be "about" some date, unless the record was difficult to read.  (Washtenaw Co. is adjacent to Livingston Co., as is Ingham Co.)

2.  1860 Census Images (online at Genealogy.com; Image #8 of 27 — indexed "Hiopkins"):  Plainfield P.O., Unadilla, Livingston Co., MI, p. 9, PN 9, 57/57, enumerated 5 Jun 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):¤•

Philander Hopkins	67	M		Farmer	3700	475	Vermont
Deborah      "	63	F					N York
Philander    "	23	F		Do			Do
Emeline W    "	10	F					Do
Mellville J Titus	35	M		Farm Laborer			Do
Alpheus C    "	5	M					Mich
Martha M     "	25	F					N York

Philander & Emeline were married in January.  Emeline is young, but she's not that young!

3.  1870 Census Index/Images (online at Genealogy.com; Image #10-11 of 28):  Brighton P.O., Unadilla Twp., Livingston Co., MI, pp. 248B-249A, PN 10-11, enumerated 12 Aug 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤•

80	85	Hopkins Philander	33	M	W	Farmer	5500?	2200	New York
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		_______ Emeline	25	F	W	Keeping house			New York
		_______ Sarah A	3	F	W	at home			Michigan
		_______ James A	?/12	M	W	at home			Michigan	Aug
	86	Hopkins Deborah	75	F	W	retired			New York

Deborah is Philander's mother.

4.  LDS.  Family Search: Census Records: 1880 United States (online at FamilySearch.org):¤•

Census Place: Unadilla, Livingston, Michigan
Source: FHL Film #1254592; NARA Film #T9-0592; Pg 233C
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
Philander HOPKINS	Self	M	M	W	43	NY	Farmer	VT	NY
Emeline HOPKINS	Wife	F	M	W	35	NY	Keeping House	CT	NY
Sarah A. HOPKINS	Dau	F	S	W	13	MI	At Home	NY	NY
James A. HOPKINS	Son	M	S	W	10	MI	At Home	NY	NY
Edna EGLESTON	Mother	F	W	W	70	NY		CT	CT
Robt. H. HAWLEY	Other	M	S	W	26	MI	Farm Laborer	ENG	ENG

The "Relationship" should always be to the Head-of-Household (Philander), so Emeline's mother should have been labeled "Mother-in-Law."

5.  Michigan Department of Community Health.  GenDIS: Genealogical Death Indexing System, 1867-1884 (online at the michigan.gov web site):

Name:	HOPKINS, Emeline
Date of Death:	19 Oct 1884
Ledger Page:	149
Record Number:	80
Place of Death:	Unadilla
County of Death:	Livingston
Sex:	female
Race:	white
Marital Status:	married
Age:	40 yr 3 mo 5 dy
Cause of Death:	rheumatic cardiac
Birthplace:	New York
Occupation:	housekeeper
Father's Name:	Egleston, James
Father's Residence:	Michigan
Mother's Name:	Egleston, Edna
Mother's Residence:	Michigan
Date of Record:	23 May 1885

8.  Birthdate calculated using Ben Buckner's JavaScript Birthday Calculator.

Name	Deathdate	Age at Death	Result
Emeline	19 Oct 1884	5d 3m 40y	14 Jul 1844
(Calculated birthdates should always be prefaced with "ca." — you can't be certain the person who calculated their age did it correctly.)

9.  Livingston County Clerk.  Livingston County, Michigan, [Partial] Death Index, 1867-1948 (online at the Livinston County MIGenWeb site; extracted from LDS microfilm by Dianne Richards — the index is not complete for the period covered):

Last Name	First Name	Vol	Page
HOPKINS	Emeline	1	143