It can't be calculated if the reference date is before the birth date.
For those born on February 29, the birthday may be treated as March 1 in non-leap years.

FAQ

Is what I enter sent anywhere?

No. Everything is processed inside the browser on your device.

Can it show traditional East Asian age?

This tool is for completed years. Traditional age is roughly one or two more.

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Guides for this tool

How to Calculate Age from a Birth Date (Free)Finding Age on a Past or Future Date How Many Days Since Birth Days Until the Next Birthday Age for Those Born on February 29 What to Do When It Does Not Work Age Calculation Without Uploading

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