12 - 13 I think. First time it was okay, didn't feel much pain, and I remember thinking "what the heck are they all moaning about? Is this it? Heck I can live with that, nothing to it pfff. But then the secondo time...Owww myyy goddd!!! C r a m p s like te wouldn't believe!!! I thought I'd die, it was that excrutiating painfull. And it still is when I forget to take my painkillers. Thank god for Nurofen!