Chronological Age & Leap Year Calculations
Calculating exact chronological age involves determining the precise elapsed duration between two calendar dates, accounting for leap years, variable month lengths (28 to 31 days), and daylight saving adjustments.
1. Standard Calculation Convention
In most modern civil jurisdictions, an individual's age increases by one full year on the anniversary of their birth. In traditional East Asian age reckoning, a person is considered one year old at birth and gains an additional year at the Lunar New Year.