Growing older without feeling old: On vitality and ageingThe past century has witnessed a revolution. Less than a hundred years ago, the average Western life expectancy was 40; now it is 80. And there is no end in sightthe first person who will reach 135 has already been born. It's the most radical change in our society since industrialisation, and naturally, it raises many questions. What do longer life spans mean for the way we organise our societies? How can people best prepare themselves for living