I have been dipping in and out of meditation fro the past 5 years. I have also used some guided meditation in my classes to help students focus. I have found it to be an effective tool with all age groups. You have your initial few giggles the first time, but once I explain the reason and science behind the activity kids get on board. I have also sent guided meditations to students whom are having difficulties winding down and switching off before sleep, with positive feedback.
This article delves even further with a teacher creating a meditation club, I would love to try this. Click on the picture for the full article.