You can. Some years ago you were a baby, now you are not, some years in the future you will be old, etc.
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Earthworms vary greatly in their length.
The frequency of a pendulum varies with the square of the length.
The frequency of a pendulum is inversely proportional to the square root of its length.
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.
This is the length of time that an animal is pregnant for.