I thought I was submitting a suggestion for software correction.   I didn't realize this was also available for community discussion.  So with that, I guess I will respond.

IronMan - I agree with much of your response.  Ultimately, after all my input, I should always review tax return to see if it is calculating as I would expect based on the details of my clients input.  I try to do a thorough review on every return.  That being said, a minor calculation error on a form is not as easy to discern sometimes, especially with a long day of client meetings.

As to your additional comments 

1) yes, I could have discerned the older child's age as I was reviewing the invoice for the dependent care.   

2) yes, I believe the software dropped the ball.  The birthdate is entered correctly since it shows as age 15 on the dependent section of the information page.

I already submitted a santized file for review, and if I understood the verbal explaination on my call, they suggested that since there are additional ways that the child & dependent care expenses may be qualified expenses, it won't automatically prevent the calculation for over age 13.  

I would like to better understand what additional ways that a child or dependent may qualify.  The only way I am aware is a disabled child or dependent will qualify at any age.  Therefore, If I had checked the box in the dependent section (Information page), the expenses would then be qualified and flow to form 2441.  To be clear, the disabled box was NOT checked, so that is why I would not expect the software to allow the expense of a 15 yr old child to flow through to Form 2441.

For yours or the community's sake, I hope I have given a thorough enough response for you to understand that I don't take this type of activity lightly, and want to make sure that a simple calculation error may need to be corrected within the software to benefit us all.