Does anyone have any advice on how to work this out?
I have found the man I'm looking for on the 1841 census, it says he is aged 55 (probably rounded up or down I know) and is living in Nottinghamshire, in the " born in county?" box it says Yes.
He is also on the 1851 census, aged 71 but his birthplace is now London, Middlesex. I know that he is the same person. It isn't a particularly common surname in the area, he has the same wife and children, is living in the same place and even has the same neighbours so it must be him.
How do I work out which versions of DOB and birthpace are the right ones? He is dead by 1861 so I can't check there.
Any suggestions?