Ive taken my daughter on the back of a 1969 vespa scooter from the age of 5 for short trips around the close and since she got older on the back of my v7 guzzi for the DGR and May day runs. She loves it and doesn't ever want me to sell any bike as she thinks she'll never be able to go on the back of one again. My wife is terrified of the idea of her being on the back but accepts that she has a choice, enjoys it and wears all the right protective gear. Id take her out on it anyway regardless of what my wife thought. Shes my daughter too and i wouldn't put her in a dangerous situation or ride in a manner that could be deemed dangerous with her on the back. I have just got an MV dragster rc which i wont take her out on but the guzzi or slower less mental machines i dont have an issue with. She is desperate to get her own bike or scooter as soon as she is old enough. She thinks ill give her one of my bikes whens shes old enough. Good luck with that. Ill buy her her own one. If more kids rode on the back of bikes, when they got older theyd look out for them as drivers.