85 at death in 1871

There is the death of a James Clements in 1859 in church records on IFHF but it is in the Parish of Maghera so this is not him.

This might also be him:
Name:    James Clements
Registration District:    Coleraine
Event Type:    DEATHS
Registration Quarter and Year:    1871
Estimated Birth Year:    1786
Age (at Death):    85
Mother's Maiden Name:    
Film Number:    101585
Volume Number:    16
Page Number:    334
Digital Folder Number:    4200217
Image Number:    00299

Yep:
Registration details
Registration number
D/1871/93/1008/2/140
Registration district
Coleraine(pre-1973 Q4)
Registration sub-district
Articlave
Deceased details
Deceased name(s)
James Clements
Sex of deceased
Male
Marital status of deceased
Widowed
Date of death
14th December 1871
Age at death
85
District of death
Coleraine(pre-1973 Q4)

Date of Birth from marriage entry in 1st Dunboe which shows age 26 in 1850.

Date of Birth from marriage entry in 1st Dunboe.

DoD from will in Probate Office, Derry.

Title :  Date of Death : 12 October 1899
Surname : McClements Date of Grant : 2 October 1907
Forename : Robert Reseal Date : 
Registry : Londonderry Effects : Effects £171 8s. 9d.
No Image 
Full Abstract :
Probate of the Will of Robert M'Clements late of Altibrian County Londonderry Farmer who died 12 October 1899 granted at Londonderry to Robert Savage Labourer.

A trawl up as far as 1906 has NOT found his death in Civil Records.  He may have died circa 1885 when the Samuel McClements in House 8b in Lower Balteagh is scored out.  Hoever, his wife is given as married rather than widowed when she died in 1897, so the hunt goes on post 1906!

I could not find him in the online 1901 Census so this might be him (but the registration district should surely be Coleraine although the dates fit well):
Name:    Samuel M'Clements
Registration District:    Londonderry
Event Type:    DEATHS
Registration Quarter and Year:    Jul - Sep 1900
Estimated Birth Year:    1825
Age (at Death):    75
Mother's Maiden Name:    
Film Number:    101601
Volume Number:    2
Page Number:    99
Digital Folder Number:    4201705
Image Number:    00187
Does not seem to be him:
Registration details
Registration number
D/1900/157/1020/10/39
Registration district
Londonderry(pre-1973 Q4)
Registration sub-district
Claudy
Deceased details
Deceased name(s)
Samuel McClements
Sex of deceased
Male
Marital status of deceased
Married
Date of death
6th July 1900
Age at death
75
District of death
Londonderry(pre-1973 Q4)
Son, Robert was PAD and both were from Gortnaskey in the reg sub dist of Claudy, which is miles away.

Is this him:
Name:    James M'Clements
Registration District:    Coleraine
Event Type:    DEATHS
Registration Quarter and Year:    Jul - Sep 1896
Estimated Birth Year:    1830
Age (at Death):    66
Mother's Maiden Name:    
Film Number:    101599
Volume Number:    1
Page Number:    299
Digital Folder Number:    4200681
Image Number:    00151