This method is for people four years old and on up.
Teachers, parents, group leaders(boys scouts, girl scouts, church, and synagogue youth groups.)
Many of the activities work across the age range.
Some games may take a longer time and more preparation for younger ones and can be mastered quickly by adolescents or adults.
The games can be learned and led by folks with little or no music experience.
And with more musical and leadership skills, you can go farther.