How to use: Calculate precise age down to years, months, and days from birth date. Enter Birth Date (date of birth). Optionally enter Target Date to calculate age on a specific date (leave empty for current age today). Results show: Exact Age (years, months, days), Total Days lived, Total Weeks, and Total Months. Useful for: precise age verification, milestone celebrations (10,000 days old), age requirements (must be 18 years old), retirement planning, school enrollment (must be 5 by September 1st), and legal age documentation. Fun facts: Average lifespan = 29,000 days. Sweet sixteen = 5,840 days. Century mark = 36,500 days.