Ageing. It’s inevitable. We all want to make it into our senior years, but no-one wants to get there to find it's not much fun. The greatest challenge is dementia. It's estimated 400-thousand Australians will be diagnosed with dementia in the next five years and that number will more than double in 30 years. Subscribe here: http://9Soci.al/chmP50wA97J

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So the race is on to try and find better treatments, if not a cure. America is leading the hunt, and we meet a group of elderly men and women who hold the key. They are taking part in the world’s largest and longest study into dementia, and the results are changing what we know about the disease.