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A birthday is a day when a person celebrates the anniversary of his or her birth. Birthdays are celebrated in numerous cultures, often with a gift, party, or rite of passage. The celebration of a birthday usually is thought to mark how old a person is, traditionally stopping when death occurs and only stating that if still alive, they would have been (number of years) old. Some contemporary writers ignore this aspect, however, and keep counting the years since the date of birth of famous people, such as proclaiming that it is Shakespeare's "four hundredth birthday" (although he died at the age of fifty-two) instead of noting that it is the four hundredth anniversary of his birth.
Many religions celebrate the birth of their founders with special holidays
In most legal systems, one becomes designated as an adult on a particular birthday (often between 14 and 21), and reaching age-specific milestones confers particular rights and responsibilities. At certain ages, one may become subject to military conscription or become eligible to enlist in the military, to marry without parental consent, to vote, to run for elected office, to legally purchase (or consume) alcohol and tobacco products, to purchase lottery tickets, or to obtain a driver's license.