I had just under 3,000 went I did my first track day and then I started racing immediately after that because I was hooked. There are definitely advantages and disadvantages. It's like driver's licenses. Not everyone is mature enough at 16 to have a license, but some people are way mature and are fine.Low said:
The important thing to decide is are you comfortable with your bike. When you come to a stop sign, do you do everything automatically without thinking? (no more of that, ok "downshift, put foot down, grab brake....phew...I'm stopped"). Are you comfortable with taking turns, etc. Each person has to evaluate their own comfort level. Some people may be ready after 1,000 miles of street riding, others may take longer.
The most important part is have gear. Also, are you financially prepared if you crash? Do you have proper health insurance? Can you fix damage to your bike? The chances of crashing in a beginner group at a track day are slim, but I've seen it done.