Rising house prices and a slow economy are moving home ownership beyond the reach of today's younger generations. In Berlin, one in ten new homes are constructed by Baugruppe (building groups). But what's the appeal of building your own home and community over buying a house?

A third of the 10,000 Boomers turning 65 each day are entering retirement single. The thought of being shipped off to live in a retirement home is unthinkable for many – but The Golden Girls Network offers house sharing for older single women who are still young at heart.

More than a quarter of British companies are set up by people aged 50-65 – with a higher success rate than any of their younger counterparts. But why are so many older 50s taking on challenges and starting new careers, when their parents rejoiced at the thought of retirement?

Seoul has embraced peer-to-peer businesses and become the sharing economy’s model city. Now, the Sharing City initiative is turning it into a blueprint for city governance. But what makes Seoul ideal for this experiment? And what’s really driving Koreans to embrace sharing?