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Why do you want to use condition feature only to calculate age? You can take advantage of our "Form Calculation" widget to achieve your requirement. You need to add following formula to calculate age;
floor((current date - date of birth) / 365)
Please check the screenshot below for all the steps:
If you want to achieve this through conditions only, you can take advantage of our "UPDATE / CALCULATE FIELD" condition feature. The formula required to calculate age remain same as above. Please check the screenshot below:
You may also like to take a look the following demo form I created for your: https://form.jotform.com/61287509002956 Feel free to clone this form for a closer look. The following guide should help you in form cloning: https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL
Hope this helps.
Do try it out and get back to us if you have any question.