Here's a link to the 1841 census entry. His son is James and wife is Anne and the 1-yr old Charlotte and description as a 29 year old grocer proves the identification. They're possibly living in some sort of lodging house. He is transcribed as being born in Ireland - probably correctly - although from the squiggle on the digitized image it could be Scotland.
"England and Wales Census, 1841," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M7MZ-7N7 : 30 October 2015), George Mahan, Clifton, Gloucestershire, England; from "1841 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO HO 107, The National Archives, Kew, Surrey
George Mahan M 29-33 Ireland
James Mahan M 3 Gloucestershire
Charlotte Mahan F 1 Gloucestershire
Anne Mahan F 28-32 Gloucestershire
Ignore the 29-33 and 28-32 - they were 29 and 28. In 1841 adult ages were meant to be rounded do the nearest 5. So some clown has programmed the logic that an age of N actually means between N and N+4. This is correct for rounded ages but of course doesn't apply where the enumerator has just given the correct age.
