Date of Birth from 1901 census.

Could this be him:
Church Baptism Record
Name:    Thomas Gordon    Date of Birth:    
         Date of Baptism:    07-Jan-1855
Address:    Lislea    Parish/District:    FIRST KILREA
Gender:    Male    County    Co. Derry
Father:    James Gordon    Mother:    Mary Campbell
Occupation:            
Sponsor 1 /
Informant 1:    
Sponsor 2 /
Informant 2:    
Notes:

Or this:
Church Baptism Record
Name:    Thomas Gordon    Date of Birth:    
         Date of Baptism:    09-Nov-1856
Address:    Lislea    Parish/District:    FIRST KILREA
Gender:    Male    County    Co. Derry
Father:    James Gordon    Mother:    Mary Campbell
Occupation:            
Sponsor 1 /
Informant 1:    
Sponsor 2 /
Informant 2:    

DoD from Wills Calendar in Derry Probate Office, where Letters of Administration were awarded to Thomasina Gordon, valued at £559.15.0.

Title:    
Forename:  Thomas   
Surname:  Gordon   
Alt Surname:    
    Date Of Death:  31/01/1903   
Date Of Grant:  04/06/1903   
Effects:  Effects £559 15s.   
Registry:  Londonderry    
Full Abstract:
Administration of the estate of Thomas Gordon late of Lislea County Londonderry Farmer who died 31 January 1903 granted at Londonderry to Thomasina Gordon Widow.

Name    THOMAS GORDON
Year of Death    1903
Group Registration ID    4613650
SR District/Reg Area    Coleraine
Deceased Age at Death    44
Image
Oh dear, his death cert contains a note from the coroner saying he died of brain injury due to being thrown from his horse while under the influence of drink.

Date of Birth = 1901 census.  52 in 1911

Title :    Mrs    Date of Death :    21 February 1954
Surname :    Gordon    Date of Grant :    29 April 1954
Forename :    Thomasina    Reseal Date :    
Registry :    Belfast    Effects :    Effects £144 11s 8d
No Image
Full Abstract :
Gordon Thomasina of Lislea Portglenone county Londonderry widow died 21 February 1954 Probate Belfast 29 April to Robert Neely McKay farmer. Effects £144 11s. 8d.

D/1954/96/1008/18/15    Thomasina    Gordon    21st February 1954    95        Female    Coleraine(pre-1973 Q4)

Date of Birth - 1901 census.

Date of Birth - 1901 census.

D/1965/94/1008/41/300    John    Gordon    23rd August 1965    74        Male    Coleraine(pre-1973 Q4)


Title :    Mr    Date of Death :    23 August 1965
Surname :    Gordon    Date of Grant :    29 February 1968
Forename :    John    Reseal Date :    
Registry :    Londonderry    Effects :    Effects £2019 1s 0d
No Image
Full Abstract :
Gordon, John of "Roselea" Lislea (Portglenone P.O.) county Londonderry farmer died 23 August 1965 at Coleraine Hospital Coleraine county Londonderry Probate Londonderry 29 February to Thomas Gordon farmer. Effects £2019 1s.

Date of Birth - 1901 census.

Civil Birth Record
Name:    Robert James Gordon    Date of Birth:    24-Aug-1893
         Registration Date:    
Address:    Lislea    Parish/District:    KILREA
Gender:    Male    County    Co. Derry
Father:    Thomas Gordon    Mother:    Thomasinia Mcmullan
Occupation:    Farmer        
Sponsor 1 /
Informant 1:    Thomas Gondon
Sponsor 2 /
Informant 2:    
Notes:
REGISTER RECORDS THE FATHER AS THOMAS GORDON JUNIOR.

I am almost certain that this man was killed in action during World War 1 as there is a Robert James Gordon listed on the Roll of Honour in 1st Kilrea Presbyterian Church.

https://www.cwgc.org/find-war-dead/casualty/1737879/gordon,-robert-james/
Rifleman
GORDON, ROBERT JAMES
Service Number 26091
Died 07/06/1917
4th Bn. 3rd
New Zealand Rifle Brigade
Son of Mrs. T. Gordon, of Lislea, Portglenone, Co. Derry, Ireland.
Commemorated at MESSINES RIDGE (N.Z.) MEMORIAL
Location: West-Vlaanderen, Belgium
Number of casualties: 828
See cemetery plan
MEMORIAL DETAILS

https://weshallrememberthem.wordpress.com/
With a population of just over a million New Zealand sent 103,000 men overseas in the First World War. 18,500 died and over 50,000 were wounded.
At this time 95 years ago Australian and New Zealand troops were preparing for their role in the battle for Messines Ridge near Ypres in Belgium. It was the first time they had actually fought alongside each other on the Western Front. The attack was carefully prepared – twenty-four mines, packed with over 500 tonnes of ammonal had been placed under the German lines. When they exploded at 3.10 a.m. on June 7th 1917  it is said the sound of the explosion could be heard in London. (The film “Beneath Hill 60” tells the story of the Australian tunnellers in Flanders.)
For eleven days prior to the attack 3.5 million shells reduced Messines and Wystschaete to rubble and the ridge to a brown wasteland. This poem was published in “New Zealand at the Front” – a magazine published and illustrated in Flanders by men of the New Zealand Division 1917 issue, page 141.
The report from the Auckland Weekly News (30 August 1917) states “The Great Battle of Messines Ridge. Where the New Zealanders played a glorious part: A view of a mashed German Observation Post and Trenches in the vicinity of the Ridge.
However, the ‘Battle of Messines’ lasted another week, as German guns bombarded the newly captured areas with increasing ferocity. By the time the New Zealand Division was relieved 700 men were dead and another 3000 wounded.

Date of Birth - 1901 census.

Civil Birth Record
Name:    Catherine Gordon    Date of Birth:    12-Nov-1895
         Registration Date:    
Address:    Lislea    Parish/District:    KILREA
Gender:    Female    County    Co. Derry
Father:    Thomas Gordon    Mother:    Thomasinia Mcmullan
Occupation:    Farmer        
Sponsor 1 /
Informant 1:    Mary Gordon
Sponsor 2 /
Informant 2:    
Notes:
INFORMANT IS RECORDED AS BEING THE CHILD'S GRANDMOTHER

Date of Birth - 1901 census.

Civil Birth Record
Name:    Samuel George Gordon    Date of Birth:    28-Apr-1898
         Registration Date:    
Address:    Lislea    Parish/District:    KILREA
Gender:    Male    County    Co. Derry
Father:    Thomas Gordon    Mother:    Thomasina Mcmullan
Occupation:    Farmer        
Sponsor 1 /
Informant 1:    Thomas Gordon
Sponsor 2 /
Informant 2:    
Notes:

Date of Birth - 1901 census.

Civil Birth Record
Name:    Letitia Gordon    Date of Birth:    28-Nov-1900
         Registration Date:    
Address:    Lislea    Parish/District:    KILREA
Gender:    Female    County    Co. Derry
Father:    Thomas Gordon    Mother:    Thomasina Mcmullan
Occupation:    Farmer        
Sponsor 1 /
Informant 1:    Mary Gordon
Sponsor 2 /
Informant 2:    
Notes:
INFORMANT: GRANDMOTHER