depends on whether or not they're afraid of bungee cords and duct tape... I kid of course. I would think when they're old enough to hold on for themselves and understand that not doing so will be very bad..
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I'm not "fat."
I'm "Enlarged to show texture."
Handle every stressful situation like a DOG: If you can't eat it or hump it, pi$$ on it & walk away.
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