A recent post prompts me to comment on the recording of an individual's year of 
birth. Frequently it is calculated from an age given in a census or death 
record for example, and common practice is to deduct the stated age from the 
year of the record to arrive at the birth year. But, is this correct?

Let us look at the English censuses; these are usually taken in March, so if 
someone was aged 8 at the time of the 1911 census then there birth year would 
be 1911-8=1903. But consider, the birth actually took place between March/April 
1902 and February/March 1903, so the probability is that the birth year was 
actually 1902.

Naturally, the odds on which year a person was actually born will vary 
according to the month of the event. All the major websites use the simple 
calculation when using the year of birth and death, so caution. The English 
1911 census also adds a further field recording the number of years married 
and, again, the probable year of marriage would depend on the month of the 
census, in this case March so the calculation would be as given above for 
births.

It is most common in users' databases for the owner to have used the simple 
calculation when recording a date which could, therefore be a year out. Mind 
you, given the honesty of people about their ages a wider variation is also 
quite likely.

Ron Ferguson
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