I'd check with your local alateen to see what age range they allow. Ours has an 8 yr old attending. Also, our church's
Celebrate Recovery has a section for younger kids (it is a christian organization.)
I wasn't having any luck convincing my teens (14 & 15) to try either group. One of the alanon sponsors attends an al-anon meeting that I attend. I asked her how to convince the kids to try it. Her suggestion was to not make it a choice. Tell them they had to attend 6 meetings before they could quit. That's the tactic I've chosen to try. I told them that they would be attending this week (weather permitting, we have 6" of snow on top of 1/2" of ice.) We'll see how it goes.