Is there a statute of limitations for collecting money owed from a civil lawsuit?

In 2002 I used a business partner for approximately $30,000 . We settled for $8,000.00 payable at $200.00 per month. If the defendant failed to make on time payments, the amount owed was to revert to the $30,000 . The defendant made approximately 5 or 6 payments, then stopped and moved to another state. This made the amount owed go to $30,000. I recently discovered his whereabouts, so I was wondering if it had been too long to try to collect the rest owed. Thank you for your time.