Hello All!
So much information again!
Found the following, thought it might be of interest. The 1841 census info is displayed on the first page of the census itself. I only found it as one of my George look-ups was on the adjacent page to the information so it is literally 'discovered by chance'.

There is a good deal more to this info, pity the data collected wasn't as comprehensive! We know ages were rounded down but I, for one, hadn't realised it could be (officially) by up to 4yrs. If folk were unsure or lied about their age the margin between truth and imaginary ages could be very wide. No wonder we can have such difficulty finding folk!
1841 England Census
Name: George Trodd Age: 4 Estimated Birth Year: abt 1837
Civil Parish: South Stoneham Hundred: Mainsbridge (Lower Half)
Registration district: South Stoneham. Sub registration district: South Stoneham
Bitterne
John Trodd 35, Victualler. Mary Trodd 30. Mary Trodd 9. Harriett Trodd 7.
George Trodd 4. Ellen Trodd 1. Jane Gibbons 11, who is Jane ? (A cousin? A playmate of Mary & Harriets?).
About 1841 England Census
This database contains an every name index to the 1841 England Census with links to images of the original census returns. Information available in this database includes: name, age, estimated birth year, relationship to head of household.
The 1841 Census for England was taken on the night of 6 June 1841. The following information was requested:
Name of the street, place, road, etc., House number or name
Name of each person that had spent the night in that household
Age* *** (indicated by which column the age is recorded in)
Profession or occupation. Where born**
*The ages of people over 15 years old were usually rounded down to the nearest 5 years. Therefore, someone who was actually 24 years would have their age listed as 20, and someone who was actually 27 years old would have their age listed as 25.
**The "Where Born" column only asked two questions - 1) whether born in same county, and 2) whether born in Scotland, Ireland, or Foreign Parts. Possible answers and abbreviations to question #1 include: Yes (Y), No, (N), or Not Known (NK). For question #2, the following abbreviations were used: Scotland (S), Ireland (I), and Foreign Parts (F).
Enumeration forms were distributed to all households a couple of days before census night and the complete forms were collected the next day. All responses were to reflect the individual's status as of 6 June 1841 for all individuals who had spent the night in the house. People who were traveling or living abroad were enumerated at the location where they spent the night on census night. All of the details from the individual forms were later sorted and copied into enumerators' books, which are the records we can view images of today. The original householder's schedules from 1841 to 1901 were destroyed.
I have a copy of the full details if anyone feels the need for them. Covers about 3 x A4 sheets!
GP