Yes, I take my 11 year old out every once in a while.
If you click on the link below in my signature block you can see the
butt-stop modification I made to a second pillion seat to give him a bit of confidence.
The other thing I can highly recommend is "
love handles". These ensure that the child can get (and keep) a good grip and inspires confidence for both pilot and passenger.
Motorcycle/Jet Ski Passenger Pillion Belt Love Handles Deluxe: Amazon.co.uk: Car & Motorbike
Cheers,
Ian