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"Exercise buys you three to seven additional years of life. It is an antidepressant, it improves cognitive function and there is now evidence that it may retard the onset of dementia."
The advice from experts is that everyone should do at least 20 minutes of walking or jogging a day, given the sedentary lifestyles and changes in diet that have contributed to high death rates from heart disease. Exercise can also improve brain functioning.
Exercise brings benefits at whatever age the person starts. People who start exercising at the age of 70 are less likely to go on to develop a condition that leads to irregular or racing heart rates in 10 per cent of people aged over 80.
"The study brings a bit more understanding of why physical activity has that effect," said Christi Deaton, Florence Nightingale Foundation Professor of Clinical Nursing Research at Cambridge Institute of Public Health.
"It helps us understand the process of cellular ageing, as that's what drives our organ system and body ageing, and the effects physical activity can have on the cellular level.
"The more active you are, and it doesn't matter when you start, the more benefit you are going to have."
Heart attacks are mainly triggered by coronary heart disease, which kills around 73,000 people in the UK every year and is the leading cause of death in both sexes. Heart disease generally affects more men than women, although from the age of 50 the chances of developing the condition are similar for both.
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