If AERC rules 10.3, 10.3.1 and 10.3.2 are met an AERC member 14 years or older who has completed 500 miles or more in the AERC rider mileage program may ride unsponsored, but will compete in the Senior division. Such unsponsored rider must have on file in the AERC office a letter by parent or guardian which consents to and requests unsponsored status. The AERC office will then provide a letter for this unsponsored rider verifying 500 miles in AERC rider mileage program, which letter must be presented to ride management at check-in or earlier. Per AERC rule 10.3.3 ride management may choose not to honor the unsponsored rider rules and may require all persons under 16 years of age to have sponsors. When sponsors are required, Juniors will not be allowed to start or continue on from any point without an adult sponsor. Additionally, all riders under 16 years must wear protective helmets when mounted.