Zingtree has built a handy webhook you can use to turn a person's birthdate into their age. You just need to add a new Webhook and install it into the node where you want the calculation to take place. Here's how to set it up:

Step 1: Add the Webhook to your Organization

1. Go to Apps & Integrations from the top menu.
2. Click on Add Webhook.
3. Give the Webhook a name (like "date to age"), and enter this for the webhook URL:

   https://zingtree.com/apps/webhook/lib/date-to-age.php

 The end result looks like this:

Step 2: Call the webhook from your tree

If you have a variable called date, you can create a new variable named age as follows:

1. Open your tree, and edit the node where you want the age calculated.
2. Under the Apps & Webhooks section, click Add App.
3. Pick the Webhook you added previously (Date to Age, for example).
4. In the Message Data area, enter something like this:

   &result=age&date=#date#

   In the above example, the variable date is used to create a new variable called age.
   
   

Your edits should look something like this:

Now just use #‌age# anywhere you want to show the person's age based upon their birthday.

Important Note: This webhook is set to work with dates that are formatted as yy-mm-dd. You may need to update your tree's date picker format. You can do this in the tree's Settings > Language section like this: