Agree with the pp. According to the DLR website, WIWF tour is described as "all ages" (
https://disneyland.disney.go.com/events-tours/disneyland/walk-in-walts-disneyland-footsteps/). Of course, whether it is appropriate for children, depends totally on the children in question. We've done the tour with younger children who were very interested in the topic, asking lots of questions, and who could keep up with all the walking. And we've done the tour with older kids/teens who made no pretense about how bored they were, whining and complaining the whole time about how bored they were -- really ruining the tour for the other guests and making the CM's job very difficult.