Of this parish according to Marriage
From Lancashire according to 1841 census

Aged 25 in 1841 (born Lancashire, Collier)
Aged 36 in 1851 (born Ireland, North)
Aged 46 in 1861 (born Ireland)
Aged 56 in 1871 (and married to Mary)

Deaths Mar 1882   (>99%)
BROOKS James     67     Bolton     8c, 171

Aged 30 (rounded) in 1841, born in Lancashire
Aged 30 when died in Jan 1842 (from Darcy Lever)

Married at Middleton, St Leonard (near Darcy Lever)

Name    Margt Mather
Event Type    Baptism
Baptism Date    21 Jul 1811
Baptism Place    Bolton-le-Moors, St Peter, Lancashire, England
Father    Richd Mather
Mother    Margt Mather
Reference Number    GB127.L243/1/2/3
Abode: Breightmet


Name    Margt. Mather
Gender    Female
Birth Place    Bret.
Baptism Date    21 Jul 1811
Baptism Place    Bolton-le-Moors, Lancashire, England
Father    Richd. Mather
Mother    Margt.
FHL Film Number    1966745
Reference ID    item 1

Margaret must have died sometime after giving birth to Hannah in 1838.
James Brooks (Widower and Collier) remarried Sarah in 1844.

The death in Darcey Lever fits perfectly:
Margaret Brooks, D'y Lever, Jan 5 1842, 30 years

Margaret died soon after the 1841 birth of Samuel.

Name    Margaret Brooks
Gender    Female
Death Age    30
Birth Date    1812
Death Date    1842
Burial Date    5 Jan 1842
Burial Place    Lever, Parish of Bolton Le Moors, Lancaster Co.
FHL Film Number    1545460
Reference ID    it 38a/39, p 5

name: Alice Mather 
gender: Female 
christening date: 21 Nov 1830 
christening place: Bolton-le-Moors, Lancashire, England 
father's name: 
mother's name: Margaret Mather 
indexing project (batch) number: C00700-4 
system origin: England-ODM 
gs film number: 1966401 

Margaret Mather was a spinster of Darcey Lever when she had Alice and Mary baptised.

name: Mary Mather 
gender: Female 
christening date: 03 Nov 1833 
christening place: Bolton-le-Moors, Lancashire, England 
father's name: 
mother's name: Margaret Mather 
indexing project (batch) number: C00700-1 
system origin: England-EASy 
gs film number: 1966401 
reference id: item 4 p 134 

Margaret Mather was a spinster of Darcey Lever when she had Alice and Mary baptised.

2 in 1841
13 in 1851

Lancashire Birth indexes for the years: 1839
BROOKS    Hannah    MATHER    Lever, Bolton    LEV/1/344

BROOKS, HANNAH        MATHER 
GRO Reference: 1839  M Quarter in BOLTON UNION
Volume 21  Page 169

Lancashire Birth indexes for the years: 1841
BROOKS    Samuel    MATHER    Lever, Bolton    LEV/2/450

BROOKS, SAMUEL        MATHER 
GRO Reference: 1841  D Quarter in BOLTON UNION 
Volume 21  Page 151

Two possible 1842 death records:
Lancashire Death indexes for the years: 1842
BROOKS    Samuel    0    Lever, Bolton    LEV/2/129
BROOKS    Samuel    1    Lever, Bolton    LEV/2/145

Name:    Samuel Brooks
Age:    Infant
Birth Date:    abt 1842
Burial Date:    27 Jan 1842
Burial Place:    Little Lever, St Matthew, Lancashire, England
Reference Number:    L207/1/4/2
Archive Roll:    553
Abode: Darcy Lever