I fully agree that having 16- and 17-year-olds included in being election officials is a positive thing.
When I was in British Columbia, we made it a policy to try to pair up these underage election officers with well-seasoned, older election officers. You would sometimes have an older lady with a blue rinse and a younger person with blue hair, and they would learn lots from each other and were frequently excellent teams.
The young people learn really quickly. Election procedures tend to be fairly complex, and they're really good at doing the complex paperwork and the analysis that's associated with applying it.