Family of Thomas Brennan born ~1832-34 Possibly Charlestown/Kilbeagh

[jmara]

Tring to find this ancestor's parents. Know he had several children in Kilbeagh/Charlestown in 1850s and 1860s with Mary Collins. Cannot find marriage info in Ireland (first child b. 1852) but found possible marriage in England with Mary Collins-Thos. Brinnan (they also lived in Batley Yorkshire).

Searched Irish Census for 1851 and 1841 and came up with these possible hits:

1-b. 1833 https://familysearch.org/ark:/61903/1:1:QV9D-7SY5
2-b 1836. In bekan costello https://familysearch.org/ark:/61903/1:1:QV9D-QYQ5
3-b. 1833. 1841 census at killedan parish: http://search.findmypast.com/record?id=ire%2fcensus%2fsefo184151%2f95512. 
4-no age given Child in roslee, mayo in 1841: http://search.findmypast.com/record?id=ire%2fcensus%2fsefo184151%2f176815

Wondering what your opinions are about which-if any-might be him and how I might be able to find his birth and marriage records. FYI, his oldest son was Patrick and his other sons were Thomas, jr.  and John (trying to think of what Thomas Sr's father's name might be). He died in Illinois, US~ 1902 and was RC. Any help/insight/direction would be appreciated!

[Maiden Stone]

 www.irelandgenealogyprogects.rootsweb.ancestry.com/Old/county/mayo/mayorc.htm  has a list of R.C. parishes in County Mayo with year of earliest register. According to that Bekan registers begin 1832, Kilbeagh (Charlestown) 1844 and Killedan 1834. Thomas Brennan's baptism may have pre-dated a register.
Did he live long enough to claim a pension and therefore have to prove his age through baptism record or census information?

[jmara]

That makes sense. I saw that prior to the establishment of some of the RC records in Charlestown/Kilbeagh there was a chapel in Ballaghy and a Church in Tample. I wonder if these records would have been included in the search I conducted or if they are located elsewhere. Re. the question about pension, no, he immigrated to England and the U.S. Thank you much for the help.