Jackie Stewart and his wife Helen race on mini go-karts with their sons Paul and Mark back in 1971. Express/Hulton Archive/Getty Images Helen (pictured with Sir Jackie at Wimbledon in 2014) was diagnosed with dementia five years ago. Matthew Stockman/Getty Images Europe/Getty Images He launched Race Against Dementia in a bid to raise $2.5 million for research into the disease. It has already raised $3.5m. Clive Mason/Getty Images Europe/Getty Images The Stewarts are well aware that finding a cure will, in all likelihood, come too late for Helen, who is currently 77. Express/Hulton Archive/Getty Images The Stewarts are pictured in Monaco. Sir Jackie believes a totally changed approach to dementia is required for his wife and other sufferers. Express/Hulton Archive/Getty Images Prev Next