Calculate Age with Gravity Forms

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

This article requires the GP Date Time Calculator perk.

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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!

Comments

  1. sahra
    sahra November 19, 2022 at 12:50 pm

    Hello, unfortunately, the date of the day does not support the format in the holder{date_ymd}, as a result, the date of the day minus the birthday does not return the correct age. Please help. In addition, the date used is solar.

    Reply
    1. Dario Space
      Dario Space Staff November 21, 2022 at 7:13 am

      Hi Sahra,

      The :age modifier will return the Age in years based on a selected date in any format. It doesn’t calculate a date difference. If you have an active Gravity Perks license, please reach us through our support form so we can investigate this question.

      Best,

    2. sahra
      sahra November 27, 2022 at 1:51 am

      Thank you, I mean that this plugin is not compatible with solar date which is for Farsi language, it is only compatible with Gregorian date. And the question of whether the dates change from year to year means that the forms add a year to the age after being entered by the user for the next year?

    3. Samuel Bassah
      Samuel Bassah Staff November 28, 2022 at 9:11 am

      Hi Sahra,

      Unfortunately, I am not really tracking your question about the date change from year to year. If what you want is to update the age in the form entry every year after the user submits the form, then you can use this snippet for that.

      With regard to your request to add support for solar dates, if you have an active Gravity Perks license, you can submit a feature request via our support form.

      Best,

  2. Pedro Rodriguez
    Pedro Rodriguez June 1, 2022 at 4:39 pm

    Great and details article.

    But what if I want to display the current date and increase it by 2. For example, today’s June 01, 2022, what if I want to display June 03, 2022 instead.

    I also notice when I put {today} it gives me the current date but I’m not able to display the date increase by 2. How can I do this, please?

    Reply
    1. Scott Ryer
      Scott Ryer Staff February 11, 2022 at 12:03 pm

      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:

  3. Michael
    Michael November 29, 2019 at 8:25 pm

    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
    1. Michael
      Michael April 13, 2020 at 1:49 am

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

      Thanks,

      Michael

    2. Ryan Donovan
      Ryan Donovan April 13, 2020 at 9:04 am

      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. πŸ˜€

  4. Faaiza Haque
    Faaiza Haque October 28, 2019 at 3:28 am

    How would I go about checking the age on a future date e.g. 11/4/2020 How would I go about doing this? The above method works out the age based on today.

    Thanks

    Reply
    1. David Smith
      David Smith Staff October 28, 2019 at 8:01 am

      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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