Mark Mendelblatt
... that American yachtsman Mark Mendelblatt won the International Optimist Dinghy National Sailing Championships when he was 11 years old?
... that American <a href="./Yacht" id="mwBfQ" rel="mw:WikiLink" title="Yacht">yachtsman</a> <b id="mwBfU"><a href="./Mark_Mendelblatt" id="mwBfY" rel="mw:WikiLink" title="Mark Mendelblatt">Mark Mendelblatt</a></b> won the International Optimist Dinghy National Sailing Championships when he was <span about="#mwt46" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"nowrap","href":"./Template:Nowrap"},"params":{"1":{"wt":"11 years"}},"i":0}}]}' id="mwBfc" typeof="mw:Transclusion">11 years</span> old?