In Venturing, you have three categories of members: Youth, Adults, and Venturing Participants. Youth are anyone 17 and younger. Adults are anyone over 21.
The hardest category is Venturing Participants.
Venturing Participants are anyone who is over 18 or will turn 18 in the calendar year. For new members, that means their birthday is in this calendar year. At rechartering for existing youth crew members, they will turn 18 in the following calendar year. Confused yet?
Sometimes knowing the goal is easier than knowing the rule. The goal is that an 18 year old legal adult has completed an Adult Application and Venturing Youth Protection Training. Why wait until a birthday? Those happen all year long? You have better things to do with your time.
Just look at your Venturers. If anyone turns 18 before the next time you do paperwork, have them complete an Adult Application and Venturing Youth Protection (Y02). Then the rules are not as important. Compliance is already complete.