A person who is born on February 29 may be called a "leapling" or a "leap year baby". In non-leap years, some leaplings celebrate their birthday on either February 28 or March 1, while others only observe birthdays on the authentic intercalary dates.
In the United States, a person legally attains a given age on the day before his corresponding birthday, i.e., the anniversary of his birth corresponding to that age. Accordingly, anyone born on a Leap Day legally turns 21 on February 28th, twenty-one years later. Incidentally, this also means anyone in the United States may legally consume alcohol on the day before his or her 21st birthday. In England and Wales, the legal birthday of a leapling is March 1 in common years. The same applies in Hong Kong as well (see Leap Years, above). In Taiwan (Republic of China) and in New Zealand, the legal birthday of a leapling is February 28 in common years.