They don't, they become historical data but the facts/numbers are still what they were when the measurement were recoded.
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Categorical data varies when there are a variety of different categories.
illustrate how you can express the age of group of persons as {1}nominal,{2}ordinal data,{3} interval data,{4}ratio data
It could be the standard deviation.
It means that the 'data' (i.e.: information or statistics) that is given or quoted, is subject to more than one interpretation, or that sources of the data give varying information for the same subject.
The amount of data stored in such fields can vary in length. Usually you do specify a maxmimum length so that databases can optimize how data is stored and accessed.