Creating a formula in Adobe using dates

[Judith5FDC]

I am using an existing PDF document someone else created for health records for fostered animals.  I want to calculate the age using the birthdate and today's date.  I am pretty new at Acrobat and have edited pages but never created formulas.  Can anyone help me?  

[Nesa Nurani · Accepted solution]

There are plenty of those scripts around the forum already, try looking here:

https://answers.acrobatusers.com/age-calculations-q66397.aspx