DoB from Pedigree file:
JOHN COULTER    
Pedigree
    Male         
            
Event(s):
    Birth:     
1824      , Antrim, Ireland
    Christening:
    Death:
    Burial:
            
Parents:
    Father:     JOHN COULTER    
Family
    Mother:     MARY HANNAH     
    
Messages:
    Form submitted by a member of the LDS Church. The form lists the submitter's name and address and may include source information. The address may be outdated. Details vary. To find the form, you must know the batch and sheet number.
                
Source Information:
    Batch Number:     8109305         
    Sheet:     27         
    Source Call No.:     1260866 

Died vefore 5th March 1895 when his wife died a widow.

BoB fron aged 59 at death in 1895 - BUT she was given as 40 in 1871 Census (= 1831) and 

Death Cert from Scotland's People Records: she was the widow of John Coulter, a coalminer, of 324 London Road, Glasgow, died of Pleurisy, Hugh Coulter, son, PAD.

DoB from IGI