Andrew is on the mark with his comments. Non-traditional students usually define themselves on several levels.
1. Having been out of school for a few years. If you have voted in more than 3 presidential elections it's pretty safe to assume your a non-traditional student.
2. Having family responsibilities. If you have a spouse, a couple kids and a mortgage. You fit the bill.
Look in your driveway...Do you see a minivan or other mommy assault vehicle?
3. You have a full time job while going to law school.
4. If "traditional students" ask you what class you teach or boy scouts offer to help you cross the street.
5. If you itemize on your taxes. That is a good hint but not conclusive evidence.
I think you get the picture. My "non-traditional" aquaintences include single parents, retired military officers, doctors, a mother of 5, people who have adult children practicing law, police officers, a stripper,firemen, a steel worker who has rotating shifts, stay home dads, and a few immigrants.