Our community college has multiple classrooms with chairdesks.  The
student population has increased in size and they no longer easily fit
into these combination units.  What ages are they recommended for and
are there any causes of action against manufacturers of this type
chair.  Thank you.

Thank you for your question.  
 
However, I believe that to answer it well, your question will require
more time and effort than the average amount of time and effort
associated with this price. Here is a link to guidelines about pricing
your question, in the pricing guide:
https://answers.google.com/answers/pricing.html