In most legal systems, one becomes a legal adult on a particular birthday (often 18th or 21st), and at different ages gains different rights and responsibilities – voting, certain drug use (for example, alcohol, purchasing tobacco), eligibility for military conscription or voluntary enlistment, purchasing lottery tickets, vehicle driving licenses, etc.

Many cultures have one or more coming of age birthdays:







The birthdays of historically significant people, like national heroes or founders, are often commemorated by an official holiday. Some saints are remembered by a liturgical feast (sometimes on a presumed birthday). By analogy, the Latin term "Dies natalis" is applied to the anniversary of an institution (such as a university).

A person's Golden or Grand Birthday, more commonly referred to as their "Lucky Birthday", "Champagne Birthday" or "Star Birthday", occurs when they turn the age of their birth day (e.g., when someone born on the 25th of the month turns 25).

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