Merely living longer is not worth doing unless it is an enjoyable experience. Rule 10 is that you should smile and feel happier with your lot in life.

Research from the Netherlands showed that older men with an optimistic outlook on life were only half as likely to suffer from cardio-vascular disease over a 15 year period as those whose world view was more negative. Britain's oldest man Henry Allingham said: "If you don't enjoy something, quit."