AgeCalc

Printable Chronological Age Worksheet

Document assessment age by hand with the same formula and edge-case rules our calculators use. Prints cleanly on one page — no navigation, no ads.

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Chronological Age Worksheet

AgeCalculators.io/chronological-age-worksheet · complete years and months only

Student / Client name or ID:
Examiner:
Date of birth:
Assessment date:

How to compute

  1. Count the calendar months from the birth month to the assessment month.
  2. Find the anniversary at that many months from the original birth date, clamping to the last day if the month has no matching birth day. If it falls after the assessment date, subtract one from the month count.
  3. Divide the complete-month count by 12 for the years and remaining months. Count days from the last completed monthly anniversary to the assessment date.
  4. Record as years;months when the form asks for complete months. Use a rounded age only when the instrument manual requests it.

Worked example

Born January 10, 2021 · assessed June 5, 2026 → 5 years, 4 months, 26 days → record 5;4 (total months: 64).

Chronological age (years, months, days):
Years;Months format:
Total months:

Edge-case rules

  • Month-end: the one-month anniversary of January 31 is February 28 (29 in a leap year).
  • Leap-day birthdays are observed on February 28 in non-leap years.
  • Count only complete months; partial months round down, never up.
Checked against the documented calculation method and its automated test suiteLast reviewed Who publishes this

Brigance, Pearson are trademarks of their respective owners. AgeCalc is not affiliated with, endorsed by, or sponsored by any of them. Brand names are used descriptively to identify the assessment formats this calculator supports.

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