Many people think of volunteer service as an adult activity. There may also be a concern about transportation and how students will get to their placements. Finally, concern may be expressed about whether students can deal with potentially new and challenging activities in a setting very different from school. The most popular grades are middle school and high school, however. There is no evidence at all to suggest that age alone determines if students can handle this role.
Many books are available with ideas for activities for different age groups.
Definitely refer to them. Once they hear your proposal, boards may be concerned about whether or not you will find enough placements for your students. In some areas of the country, rural areas in particular, agencies and service opportunities are not always readily available. One option is to place several students in one agency. This option is not always possible, but generally most agencies are willing to take three or four students, if they are asked.