How to calculate age
If you need to calculate the current age of a participant after you collect the participant's birth date, you can use this following in an Equation Type question. The following example assumes the date type question has the code DateofBirth:

{floor((time() - mktime(0,0,0,substr(DateofBirth,5,2),substr(DateofBirth,8,2),substr(DateofBirth,0,4)))/(365.25*24*60*60))}
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