Ten four-year-olds are about to meet some unusual classmates. For six weeks they will share their classroom with 11 pensioners. In an ambitious experiment – led by three geriatric specialists – the young and older group follow the same timetable in a new nursery set within a retirement village near Bristol. Inspired by a similar scheme set up 25 years ago in the US, this is the first time in the UK that an inter-generational experiment has set out to measure the impact on the health and happiness of the older group. As part of the experiment, the older group undergo tests to measure mood, memory and mobility during their daily contact with the young kids. Can a situation where four-year-olds and 84-year-olds work and play together drastically improve the health and happiness of the older group? Could this ambitious experiment transform the way Britain cares for its increasingly older population?