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

Felix EKAS Birth: Pennsylvania Husband Age at Marriage: 65 Marriage: 07 Sep 1884, Mecosta, Michigan Spouse: Lydia STROUP Wife Age at Marriage: 65 Source: Marriage Records 1859-1913. Mecosta County (Michigan). County Clerk

2.  1840 Census Index/Images (online at Ancestry.com):  not found.

3a.  1850 Census Every-Name-Index/Images (online at Ancestry.com):  can't find Felix (or Lydia).

3b.  1850 Census Every-Name-Index/Images (online at Ancestry.com, Image #29 of 32):  Perry Twp., Union [now Snyder] Co., PA, Roll M432_831, p. 113A, 194/194, enumerated 20 Nov 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):¤

Polly Ickes	30	F				"
Nancy Ickes	8	F				"

Listed next to Polly's mother, Widow Elizabeth (__?__) MOYER.  Also in Perry Township (p. 104A), there is a John ICKES (æ 11, b. PA), living with Philip & Catharine SCHNEE.  Could he be another child of Felix & Polly's?  These three are the only ICKES in Perry Township.  The only other ICKES family in Union Co., PA, is Samuel & Catharine ICKES, of unknown relationship to Felix.

4a.  1860 Census Every-Name-Index/Images (online at Ancestry.com, Image #3 of 5):  Big Rapids P.O., Town of Green, Mecosta Co., MI, Roll M653_554, p. 115, PN 13, 115/108, enumerated 18 Jun 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):¤

Phelix Ecus	42	M		Farmer	500	120	Penn
Lydia   do	42	F					do

4b.  1860 Census Every-Name-Index/Images (online at Ancestry.com, Image #2 of 34):  Freeburg P.O., Washington Twp., Snyder Co., PA, Roll 653_1182, p. 597, PN 121, 848/881, enumerated 3 Jul 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):(¤)

Henry Reinert	24	M		Shoemaker	900	100	Pennsylvania
Elizabeth  "	19	F					"
James      "	4	M					"
William    "	2/12	M					"
Nancy Iches	17	F		Servant			"

Also in Washington Township (p. 627), there is an Ann ICHES (æ 25, b. PA, servant) living with Michael & Rachael MOYER.  Who is Ann?

5.  1870 Census Every-Name-Index/Images (online at Ancestry.com, Image #5 of 16):  Big Rapids P.O., Town of Green, Mecosta Co., MI, Roll M593_690, p. 59A, PN 5, 45/46, enumerated 14 Jun 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤

Ekas Felix	51	M	W	Farmer	2000	625	Pennsylvania
____ Lydia	51	F	W	Keeping House			Pennsylvania
Straup Lewis	15	M	W	Attending School			Pennsylvania
Butterfield Mary	28	F	W	School Teacher			New Hampshire

Lewis STRAUP/STROUP is the son of Peter K. STROUP, so it's possible our Lydia is Peter's sister.  Lewis's mother is deceased, and his father has re-married, so living with a childless aunt may be a better option than living with a step-mother (assuming it was Lewis's option). 

6.  1880 Census Every-Name-Index/Images (online at Ancestry.com, Image #6 of 21):  Township of Green, Mecosta Co., MI, Roll T9_594, p. 547B, PN 6, SD 6, ED 174, enumerated 3/4 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):¤

1880:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	8	10	13	24	25	26
45	51	Ekas Felix	W	M	61		/	Farmer	PA	PA	PA
		____ Lydia	W	F	61	Wife	/	Keeping house	PA	PA	PA

.  1890 Census:  the 1890 Census Population Schedules were destroyed.

.  Broderbund.  World Family Trees.  Vol. 55, Tree #2902.

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