With better, earlier diagnosis and the clever use of technology, the UK could save £100bn in the next 15 years, according to the International Longevity Centre. The alternative: do nothing, put Britain’s health and social care system under intolerable strain and leave hundreds of thousands of families to cope alone, without the resources they need. The £26bn spent each year on dementia care in the UK would be significantly reduced if the symptoms of the disease were delayed by five years, according to the Alzheimer’s Society.