DoB taken from age of 50 in 1860 Philadelphia census record supplied by BB.  He is only 55 in the 1870 census but back to 70 by the 1880 census.

Andrew Brewster
Death Date:     25 Apr 1882
Death Place:    Philadelphia, Philadelphia, Pennsylvania
Gender:         Male
Race:   W
Death Age:      76 years
Estimated Birth Year:   1806
Birth Date:
Birthplace:     Ireland
Marital Status:         Married
Spouse's Name:
Father's Name:
Father's Birthplace:
Mother's Name:
Mother's Birthplace:
Occupation:
Street Address:         1704 Carver St., 7th Ward
Place of Residence:     Philadelphia, Penn.
Cemetery:       Mount Moriah
Burial Place:   Philadelphia, Penn.
Burial Date:    27 Apr 1882
Additional Relatives:
Film Number:    2057166
Digital Folder Number:  4058684
Image Number:   929
Reference Number:

DoB from 1960 Philly census where her age is given as 40.  She is only 55 by the time of the 1880 census!

Source: BB - a mortuary notice in the Philly Inquirer, found on genealogybank.com and a subscriber to that site sent the full data.
"On Oct 1, Mary, widow of Andrew Brewster, in her 77th year. The relatives and friends of the family are respectfully invited to attend the funeral services on Monday morning at 10 oclock, precisely at hr late residence, 2332 Garnet Street,  Interment private."

May have died before 1860 as she does not appear in the 1860 census along with the rest of her family.

BB: She could possibly be the child who was buried in 1856 without a name buried at Mt. Moriah in Philadelphia:
14.          BREWSTER'S     Child                    1856      NOV      19           12           37           S. 1/2    

DoB from 1860 Philly census where he is given as 15.

James Brewster
Death Date:     18 Feb 1862
Death Place:    Philadelphia, Philadelphia, Pennsylvania
Gender:         Male
Race:   white
Death Age:      17 years
Estimated Birth Year:   1845
Birth Date:
Birthplace:     Ireland
Marital Status:         Single
Spouse's Name:
Father's Name:  Andrew Bruster
Father's Birthplace:
Mother's Name:  Mary Bruster
Mother's Birthplace:
Occupation:     Stone Cutter
Street Address:         1223 Clarion St., 1st Ward
Place of Residence:
Cemetery:       Mount Moriah Cemetry
Burial Place:
Burial Date:    21 Feb 1862
Additional Relatives:
Film Number:    1977745
Digital Folder Number:  4009970
Image Number:   433
Reference Number:

DoB from 1860 Philly census where she is given as 10.

DoB from 1860 Philly census where she is given as 10.

DoB from 1860 Philly census where she is given as 1.