On page 35 of the ISWA publication, ISWA Tournament Rules, Regulations and Modifications and on www.iswa.com, under Rules and Regulations it states the following:
5. Pee-Wee, Bantam, Intermediate, Novice and Schoolboy wrestlers CANNOT move up an age division. Cadet age division wrestlers who are in high school may move up to the Junior age division. Senior age division wrestlers CANNOT move up to Veteran. However, persons qualified for the Veteran age division may move down to the Senior age division. This rule applies to all tournaments...not just folkstyle. This recomendation is from the USA Wrestling Sports Science Committee. If an injury were to occur, failure to comply puts your liability insurance coverage at risk. This rule has always been in effect and was made in the interest of safety.