Age had no limit when it came to getting them started for a life under canvas,I remember one of them hardly able to walk managed to get up in the morning while everyone else was still tucked up warm in our bags and drag the 10 litre plastic water container 50 yards to a water stand to fill it,though it only came back with enough water to fill the kettle.,They have all slept in the garden and have done from the age of about 10,and still do in their early teens and join me on meets,they all love cooking on the fire.