We're living for longer and longer. 10 million of the UK's population today will make it to 100 (approx. 20%). Conquering cancer, cardiovascular disease and diabetes, will add 10 years to our life expectancy. What is more, developments in nano-technology and regenerative medicine could push lifespans up to 200. Will these extra decades be ones of health or decrepitude?

The science could take us either way. The social implications of extreme longevity are also profound. The seven ages of man will become a thing of the past, while age could become the a new measure of inequality, with people in the developed world long outliving their third world counterparts.