iStockof my life looking younger than my age. I love the shock on people’s faces when I tell them how old I am (“No! You can’t be!”), and I’m proud of the many times I’ve stumped the guy at the guess-your-age booth at the Canadian National Exhibition. I credit this, in part, to a secret formula. It’s not quite the fountain of youth, but it’s the greatest anti-aging potion ever discovered: swimming in cold water.I get asked on a near-daily basis, “What could possess a person to go into freezing-cold water voluntarily?”Or, put more simply: “Are you crazy?”My love affair with cold-water...…iStockof my life looking younger than my age. I love the shock on people’s faces when I tell them how old I am (“No! You can’t be!”), and I’m proud of the many times I’ve stumped the guy at the guess-your-age booth at the Canadian National Exhibition. I credit this, in part, to a secret formula. It’s not quite the fountain of youth, but it’s the greatest anti-aging potion ever discovered: swimming in cold water.I get asked on a near-daily basis, “What could possess a person to go into freezing-cold water voluntarily?”Or, put more simply: “Are you crazy?”My love affair with cold-water...WW…