Hi Kim,
The age doesn't necessarily mean that this is not your Jane, below is a quote from the Genuki census website.
Quote, "The 1841 census is the first useful genealogical census for England & Wales. You will see that no relationships are given - except occasionally in column 5 where you may see Farmer's Wife or similar. All ages 15 and above should have been rounded down to the nearest 5 year multiple, i.e. ages shown as 15 may be 15-19, ages shown as 20 may be 20-24, etc. Another point to remember for ages is that people often said that they "were in their 60th year" meaning that they had passed their 59th birthday. If a person gave information meaning they were in their 60th year, they will be shown as being 60, whereas strictly keeping to the rules, they should be recorded as 55".
So you see that they used to round ages down, I am afraid that genealogy is not an exact science.
So don,t give up hope of this one being the right one.
Hope this is helpful.
Mick