A child is under 14 years of age and under 50kg: basically if they are older or heavier than that they need adult equipment.

So what age is too young?: Generally under three is considered too young. This is due to the coordination of motor skills is underdeveloped and the child's skeletal system being too soft to withstand the pressures of twisting and turning that skiing requires. Five is considered a better age to start snowboarding. 

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