It is such a difficult question to answer, I have 2 boys aged nearly 13, and 11 and a girl aged 9. My boys have been going out on thier bikes for rides for years now, probably aged 10 and 8. but the 8 year old is very mature for his age and does everything his older brother does. My 9 year old daughter on the other hand i feel completley different about, i just dont feel brave enough to let her do things and i am not sure if it is because she is a girl or because i have since realised the world can be a horrible place, i have started taking her to the local park to meet with her friends and then collecting her again 2 hours later, this is terrifying but i feel for her sake i hav to give her some freedom.