Age Calculator
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Variable Key
D₁= birth dateD₂= target date (today)A= age in years
Age in years
Simple year subtraction (adjusted for birthday).
Exact age in days
Total days between two dates.
D₁= birth date
D₂= target date (today)
A= age in years
An age calculator determines exactly how long a person has been alive, broken down into years, months, and days. It accounts for varying month lengths and leap years to give a precise age.
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Tip: Leap years occur every 4 years, except years divisible by 100 — unless also divisible by 400. So 2000 was a leap year, but 1900 was not.
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Fun Fact
If you live to age 80, you will have been alive for about 29,200 days, 700,800 hours, or over 2.5 billion seconds.
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