What happens if you're born on February 29 (leap day)?
In most countries, leap-day birthdays are legally celebrated on February 28 in non-leap years. Some use March 1. Laws vary by country.
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What's the difference between Korean age and international age?
Korean age: you're born as 1, +1 on every January 1st. International age: you add a year on your birthday. A December-born baby is "2" in Korean age by January 1st but still "0" in international age.
How do I calculate my exact age?
Current year minus birth year gives the base. If today's month/day is before your birthday month/day, subtract 1. The result is your age in completed years.
How Age Is Calculated Around the World
Age calculation isn't as universal as you might think. Most Western countries use the "birthday" method: you're X years old starting from the exact day of your birthday. You turn 18 when you hit that anniversary. South Korea used a unique system where everyone added a year on January 1st (so a baby born on December 31st was "2 years old" the next day). In 2023, Korea officially standardized to the international method for all legal and official documents.
Korea's Age Reform of 2023
For decades, Korea used three different age-counting systems simultaneously: Korean age (born as 1, +1 on Jan 1), calendar age (birth year subtracted from current year), and international age (standard birthday method). This caused confusion in medical, legal, and administrative contexts. The June 2023 reform mandated international age for all official documents -- contracts, medical records, government forms. Casual use of Korean age in everyday conversation remains common.
The Chinese Zodiac: A 12-Year Cycle
The Chinese zodiac assigns one of 12 animals to each year in a repeating cycle: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig. The cycle is calculated by the birth year modulo 12 (with adjustments for the exact start of the Chinese New Year, which varies by year). 2024 is the Year of the Dragon. Each animal is associated with personality traits, compatibility with other signs, and fortune predictions.
Western Zodiac: Determined by Birth Month, Not Year
Unlike the Chinese zodiac, Western astrological signs are determined entirely by the month and day of birth, not the year. The 12 signs follow the Sun's apparent path through the sky (the ecliptic). Aries: Mar 21 - Apr 19. Taurus: Apr 20 - May 20. Gemini: May 21 - Jun 21. Cancer: Jun 22 - Jul 22. Leo: Jul 23 - Aug 22. Virgo: Aug 23 - Sep 22. Libra: Sep 23 - Oct 22. Scorpio: Oct 23 - Nov 21. Sagittarius: Nov 22 - Dec 21. Capricorn: Dec 22 - Jan 19. Aquarius: Jan 20 - Feb 18. Pisces: Feb 19 - Mar 20.
Aging Demographics: The Global Picture
Life expectancy has roughly doubled over the past 150 years, from around 40 years in 1870 to over 70 globally today. Japan has the highest life expectancy at 84.3 years. Korea is close behind. The number of centenarians (people 100+) is growing rapidly worldwide -- there were about 590,000 globally in 2021, projected to reach 3.7 million by 2050. The "healthy lifespan" (years without significant disability) is typically 10 years shorter than total lifespan.
Frequently Asked Questions
What's the difference between Korean age and international age?
Korean age: you're born as 1, +1 on every January 1st. International age: you add a year on your birthday. A December-born baby is "2" in Korean age by January 1st but still "0" in international age.
What happens if you're born on February 29 (leap day)?
In most countries, leap-day birthdays are legally celebrated on February 28 in non-leap years. Some use March 1. Laws vary by country.
How do I calculate my exact age?
Current year minus birth year gives the base. If today's month/day is before your birthday month/day, subtract 1. The result is your age in completed years.