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Why it walks the calendar instead of dividing by a year length

The [msm_tool slug="age-calculator"] counts whole years first, then whole months, then whatever days are left over, borrowing from the preceding month wherever the day of the month has not yet arrived — the same way a person would count age by hand. Dividing elapsed time by an average year of 365.25 days instead drifts, and near a birthday that drift is large enough to show the wrong year entirely, which is why calculators using that shortcut occasionally disagree with each other by a full year.

Two different questions, two different figures

The totals in months, weeks and days are a running count since birth, while the years-months-days figure is a structured age of the kind an official form actually asks for — visa applications, insurance policies and school registration typically want age in complete years as of a stated date. Neither figure converts cleanly into the other, so both are shown rather than forcing one into the shape of the other.

A leap-day birthday has no single legal answer

In a common year, the calculation reaches the anniversary of a 29 February birth on 1 March, simply by walking forward through the calendar. Different jurisdictions treat that anniversary differently — some recognise 28 February, others 1 March — and where the answer carries a legal consequence, the local rule decides rather than this calculation.

Calculated against today, in your own timezone

The date of birth is compared against today as read on the device doing the calculating, so someone travelling across the date line right around a birthday may see the countdown shift by a day depending on which side of the line they happen to be standing on at that moment.

For any two arbitrary dates, this is the wrong tool

This calculation always compares a birth date against today. Finding the interval between two dates that are not "birth" and "now" — including a working-day count — is a related but different question, handled by the Date Difference Calculator instead.