Age Calculator Guide: Legal, Medical, and Personal Applications
Age calculation seems simple—subtract birth year from current year—but precision matters enormously across legal, medical, financial, and social contexts.
Legal Age Applications
- Voting Age: 18 in most democracies
- Contractual Capacity: Minors generally cannot enter binding contracts
- Criminal Responsibility: Varies from age 7 to 18 by jurisdiction
- Driving: 16-18 for passenger vehicles
Medical Uses
- Pediatric Dosing: Medications calculated per kg and adjusted by exact age in months
- Gestational Age: Pregnancy dating uses LMP or ultrasound
- Cancer Screening: Mammography begins at 40 or 50 depending on guidelines
Leap Years: The Gregorian calendar adds February 29 every 4 years, except years divisible by 100 unless also divisible by 400.