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Calculate Age with Gravity Forms

Accurately calculate a customer's age based on their date of birth.

Last updated | Written by 13 Comments

This article requires the GP Date Time Calculator perk. Buy Gravity Perks today to get this perk plus 40 other premium Gravity Forms plugins!

One of the most common fields we see on forms is a date of birth field. With the user’s date of birth you are able to calculate their age and with their age you can implement a variety of powerful interactions.

  • Restrict registration to users above a certain age.
  • Provide lower product pricing to children and seniors (see our Aged-based Pricing article).
  • Send promotional emails to customers on their birthday, personalized to their specific age.

In this tutorial, you’ll learn how easy it is to calculate a customer’s age from their date of birth using Gravity Forms Date Time Calculator.

Steps

  1. Add a Date of Birth Field
  2. Calculate Age

Step 1 – Add a Date of Birth Field

Add a Date field to your form, call it “Date of Birth”, and set your desired date format.

Date of Birth

Step 2 – Calculate Age

Add a Number field to the form and name it “Age”. In the Formula box, insert the merge tag for the Date of Birth field and add the :age merge tag modifier to it. In this example, my Date of Birth field ID is “1”.

Age Field

You’re done! Your Number field will automatically display the customer’s age based on the date entered in the Date of Birth field.

The :age merge tag modifier will always return the age in years, regardless of the Date Calculation Unit setting in the Number field.

Steps Beyond

Once you have set up the fields to calculate your customer’s age, the possibilities are endless. Use age with conditional logic, for example to hide the submit button unless the customer is above or below a certain age.

Conditional Logic Settings

You can also set up pricing or discounts based on their age. For example, to offer senior discounts. Follow the steps in our How to Set Up Age Based Pricing to learn more.

Questions? Comments?

Do you have questions or comments about this tutorial? We’d love to hear them!

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Comments

    • Scott Buchmann says

      Yep. Instead of using the :age merge tag modifier, you can calculate the age manually by subtracting the date of birth from the {today} merge tag. Rough example:

  5. Michael says

    How would we ensure this number field containing their age is automatically updated as time goes by and they get older? Does Gravity Forms do this by default or do we need to trigger it some how?

    Reply

    • Michael says

      Hi. I never did get a response to this question. I certainly would appreciate one!

      Thanks,

      Michael

    • Ryan Donovan says

      Hello Michael, Sorry for the delayed response on this one. The field will continue to update based on the input within the date field. Once the item is submitted, the birthday that was submitted will remain as the entry and they will have to resubmit for a new birthday age entry. Let us know if you have any other questions. 😀

    • David Smith says

      Hi Faaiza, you can subtract the future date from their birthdate to get the number of years between those dates which would be their age.

      Example: {Future Date:3} - {Birthdate:1}

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