Plain explanations of how age is measured and calculated, plus reference charts for quick lookups by age or birth year.
What chronological age is, how to work it out by hand, and how it differs from other ways of measuring age.
Printable-style tables for looking up an age or a birth year at a glance.
The baby age blog covers milestone ages such as crawling and first words. To calculate an age directly, browse all age calculators.