John's age accelerates with time!
Aged 40 in 1841 (rounded) .......... born 1796-1801
Aged 52 in 1851 ........................... born 1798-1799
Aged 67 in 1861 Born Edgworth .. born 1793-1794
Aged 75 in 1871 Born Turton ....... born 1795-1796
Aged 81 in 1874 (when died)


Name:    John Mather
Event Type:    Baptism
Baptism Date:    21 Nov 1794
Parish:    Turton, St Anne
Father's name:    Thomas Mather
Mother's name:    Alice Mather
Reference Number:    GB127.L98/1/2/2

John s. of Tho's & Alice Mather of Quarlton

This burial is a perfect match with John born 1798. The only problem is that John and Jane were both alive in 1871 (John 73, Born Turton, Cotton Weaver)

Burial: 10 Apr 1855 St Peter, Bolton, Lancs.
John Mather -
    Age: 57 Years
    Abode: Little Bolton
    Buried by: R. Harries Jones Curate
    Register: Burials 1852 - 1855, Page 297, Entry 2374
    Source: LDS Film 1966473

Instead:
Deaths Jun 1874   (Little Bolton, LB/48/62)
Mather     John     81     Bolton     8c, 268
or
Deaths Mar 1878   (>99%)
MATHER     John     72     Bolton     8c, 210    
or
Deaths Mar 1888   (>99%)
MATHER     John     87     Bolton     8c, 227

Name:    John Mother Orrell
Baptism Date:    6 Apr 1817
Baptism Place:    Bolton-le-Moors, St Peter, Lancashire, England
Mother:    Martha Orrell
Reference Number:    GB127.L243/1/3/2

Abode: Great Bolton (Spinster)

Lancashire Death indexes for the years: 1843
ORRELL    John M    26    Western Bolton    WB/7/158

Deaths Dec 1843   (>99%)

ORRELL     John Mather     Bolton     21, 84