It's a great feeling having them back there. My 9 and 11 year old girls beg me for rides all the time. They love getting dressed up with their sunglasses, helmets and jackets.
One day I surprised my youngest by taking her out early to "play hookey" and I picked her up on the 9. I did get some looks from some of the moms as I was getting her ready to ride home. But once we were on our way, she whispers in my ear . "Daddy, I feel so...BAD!"