Age ties in with birth date of 1811.

record_id 89453
Entry No 463
Month Feb
Day 11
Surname POWELL
Forename Mercy
Place of Residence Lane End
Age at death 71
Officiating Minister W H Taylor
Event Burial
Register Ref PFC82 in 1/4
Page 58
Parish/Chapel Christchurch
Soundex P400

I can't find a marriage for Mercy. Can anyone find her on a census please?