More generally, a calendar year begins on the New Year's day of the given calendar system and ends on the day before the following New Year's day.
See also other calendars
... from 25 to 44, 36.0% from 45 to 64, and 12.5% who are 65 years of age or older. The median age is 44 years. For every 100 females there are 99.5 males. For every 100 ...