A little erudition is of the order - many computer systems computes time deltas from a January 1, 1970 start date. For example Un*x epoch time %s displays time in seconds since 1970-01-01. Rather than enforcing users to chose a particular date or allow for no dates, lazy programmers will often pre-fill a date field with the deafult start date.
Hence we have so many 40 year olds celebrating their Birthday tomorrow.
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