Sometimes, all juniors race together. Sometimes, just the junior women race together but the race may be run with the women's cat 4 race. It depends on the interest and size of fields in your area for the most part.
When is your birthday? USCF licenses make your racing age the age you will be at the end of the year, so by the time you start racing, you might be racing as 18 anyway.
Oh, if you do race as a junior, be sure you learn about junior gearing rules (juniors are limited in the gearing they are allowed to use).



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