Take them to a big box gun store where there is plenty to look at and plenty of room. Maybe ask them their opinions of the different gun styles. Show them the lasers, wooden grips, etc, and of course show them the accessories, holsters, range bags, safes, glasses, Etc. Make it all about the shopping!
When I was looking, (I'm a mom), my 11 and 16 yr old daughters wanted to hold the guns I looked at. Also, I love my small neighborhood range, but the cramped quarters scared my kids. We took the kids to the big box gun store with range and they had a blast and were more at ease there. Now they want to go to the range with me. Gradually I will ease them into the smaller range(cheaper and closer to home).