Aged 30 at marriage in 1853.

Aged 20 when he jpoined the RIC on 21 June 1842.

Was still alive when he was pensioned out of the RIC on 1st July 1868 after serving for 25 years and 11 months.

BB found this:
Name: William Makey
Registration District: Ballymoney
Event Type: DEATHS
Registration Quarter and Year: 1874
Estimated Birth Year: 1824
Age (at Death): 50
Mother's Maiden Name:
Film Number: 101587
Volume Number: 16
Page Number: 117
Digital Folder Number: 4200219
Image Number: 00158
Collection: Ireland, Civil Registration Indexes, 1845-1958

This must be him:
Church Burial Record
Name:    William    MacKey        
Date of Death:    -Jan-1874Dec    
Age:            
Parish / District:    Finvoy    
Address:    Ballaghbeddy        
County:    Co. Antrim
Status:            
Denomination:    Church Of Ireland
Occupation:            
Sex:        
Graveyard        Informant    
Graveyard:            Relationship:    
Parish:            Name:        
County:            Address:    

Name    WILLIAM MACKEY
Year of Death    1874
Group Registration ID    N/R
SR District/Reg Area    Dublin South
Deceased Age at Death    1
Returns Year    1874
Returns Quarter    1
Returns Volume No    2
Returns Page No    566    
Ballymoney, Dirraw; 30 Nov 1874, Newbuilding; William McKay; Male; Widower; 50; Police Pensioner; Tumour on stomach, Seven weeks, Uncertified; James Boyd, PAD, Maddykeel

Question: Why does the Church Burial record give his address as Bellaghbeddy when the Civil Death Record shows "Newbuilding"?  The Griffiths Valuation DOES show a New Buildings nearby but it is the alternative name for the townland of Maddydoo Lower, which is  four townlands south of Ballaghebeddy.  James Boyd is his wife's brother who DID live at Bellaghbeddy.

Aged 27 at marriage in 1853.

Name    MATILDA MACKAY
Year of Death    1868
Group Registration ID    N/R
SR District/Reg Area    Ballymoney
Deceased Age at Death    43
Returns Year    1868
Returns Quarter    4
Returns Volume No    16
Returns Page No    118
38; 30th November 1868, Belaghbedy; Matilda Mackay; Female; Married; 43; Farmer's wife; Diabetes, Ill sometime, No Medical Attendant; William Mackay, Present at Death, Belaghbedy.

Died between 1901 census and 1911 census. Age given as 48 in 1901 census which would make her Date of Birth as c1853.  But death certificate in General Registry Office gives her as 55 in 1907 = 1852.  If I have the right marriage, her parents were married in May 1853, so she cannot be born in 1852.

BB: Have you looked at this yet on IFHF.  I didn't see it on your tree.  Finvoy CoI:
Church Baptism     MacKy     Rachel Georgina     1853     Co. Antrim
Church Baptism Record
Name: Rachel Georgina MacKy
Date of Baptism/Birth: 20-Dec-1853
Address: Ballymena [kirkinriola]
Parish/District: Finvoy
Gender:   County Co. Antrim
Denomination: Church Of Ireland
Father: William MacKy Mother: Matilda /
Occupation:  
Sponsor 1 /
Informant 1:  Sponsor 2 /
Informant 2:

I note she was two months premature.

Kirkinriola seems to be the parish that includes Ballymena, not a place within Ballymena.

There is no trace of William McKay in Kirkinriola in the GV.

 

Name    RACHEL BELLINGHAM
Year of Death    1907
Group Registration ID    3570742
SR District/Reg Area    Ballymoney
Deceased Age at Death    55
Image

Wife of a farmer, from Culmore, she died of "sarcomatous cancer of right kidney", after 12 months illness, daughter, Elizabeth Bellingham, also of Culmore, PAD