Age of participant as of January 1st of the current year.
For example, if you are 16 years old on Jan 1, then you are considered 16 years old from Jan 1 to Dec 31. If your 17th birthday is Jan 1, then you are considered 17 years old from Jan 1 to Dec 31.
If you are a rider that has aged out but are still riding a smaller bike than what is listed, a request to ride a certain class or vary rules for any person is required, it must be sent to CAMS for approval by email or in writing 48 hours before race day.