Age Calculator

This tool computes age from a birthdate to a reference date, returning years, months, and days. It supports straightforward use by individuals validating ages for eligibility, families tracking milestones, and professionals handling compliance data.
Conceptually, the calculator measures the elapsed time between two calendar dates, using standard date arithmetic that accounts for leap years and varying month lengths. It validates inputs, handles missing reference dates by using today, and yields a consistent three-part age output.
Key features include multi-field input with birthdate and reference date, precise breakdown to Y-M-D, and robust error handling for invalid dates, future dates, or missing fields. Use cases include verifying age-based eligibility, calculating pension windows, and auditing records. Batch mode and API-friendly outputs support integration with HR systems and educational apps.
What sets this tool apart is its deterministic logic, clear numeric outputs, and reliable handling of edge cases across a wide range of dates. It serves HR systems, education apps, and personal planning where accurate age values inform decisions.