
Jackie Stewart and his wife Helen race on mini go-karts with their sons Paul and Mark back in 1971.

Helen (pictured with Sir Jackie at Wimbledon in 2014) was diagnosed with dementia five years ago.

He launched Race Against Dementia in a bid to raise $2.5 million for research into the disease. It has already raised $3.5m.

The Stewarts are well aware that finding a cure will, in all likelihood, come too late for Helen, who is currently 77.

The Stewarts are pictured in Monaco. Sir Jackie believes a totally changed approach to dementia is required for his wife and other sufferers.