Science is, rightly, searching for drugs to arrest ageing or to slow the advance of dementia. But the evidence suggests that many of the most powerful factors determining how you age come from what you do, and what you do with others: whether you work, whether you play music, whether you have regular visitors.

The biggest barrier to dealing with climate change is us: our own attachment to habits that are hard to shift, and our great ability to park or ignore uncomfortable choices.

All over the world, social innovation is tackling some of the most pressing problems facing society today - from fair trade, distance learning, hospices, urban farming and waste reduction to restorative justice and zero-carbon housing. But most of these are growing despite, not because of, help from governments.

So is civil society prepared for the future? Probably not. Most organisations have to live hand to mouth, juggling short-term funding and perpetual minor crises. Even the bigger ones rarely get much time to stand back and look at the bigger picture. Many are on a treadmill chasing after contracts and new funding.

Big business increasingly likes to portray itself as socially concerned, adopting the style of civic action through 'campaigns' of varying degrees of cynicism.

The most important innovators often don't need any technologies - just imagination and acute sensitivity to people's needs.

L'Oreal's slogan 'because you're worth it' has come to epitomise banal narcissism of early 21st century capitalism; easy indulgence and effortless self-love all available at a flick of the credit card.