850,000 people in the UK are thought to be living with dementia. The writer Nicci Gerrard tells Andrew Marr about her father’s slow death from the illness. She explores issues around memory, language and identity, as well as asking how society will cope as the population ages and the number of people suffering with dementia rises into the millions.

But why and how do we age? The science journalist Sue Armstrong has been investigating what happens to cells when the body gets older, and whether ageing really can be treated like any other disease waiting to be cured. Life expectancy has risen sharply in the last half century globally, but can it keep on rising?

The street theatre performance, Bed, involving elderly actors lying in beds in town centres around the country, was devised by older members of Entelechy Arts who wanted to make a statement about isolation and invisibility. The Artistic Director David Slater says the arts have an important role to play in improving people’s lives no matter how old.

The poet John Agard is 70 this year. In his latest collection, The Coming of the Little Green Man, he explores the world from the stance of the outsider. In a series of mischievous, satirical fables he gives voice to the political and spiritual, comic and poignant.