Thanks for the help. I really appreciate it.
I've just been looking at the census again.
In 1841 he's listed as birth year 1816, born Northumberland.
In 1851, birth year is 1813, born St.John Lee.
In 1861, birth year is 1813, born Hexham.
He was married to Margaret Forster on 4th December 1831, the only reference I can find to a Margaret Forster in the Hexham area for the period is a baptism record for 7th April 1816. As they are both listed in all the census records as being the same age, I'm wondering if the 1841 version of an 1816 birth year could be the correct one.