Instead, they are due to a lack of activity. In particular, deaths from heart disease could probably be reduced if all people participated in mild, regular exercise.
Many people feel that it is dangerous to exercise after a certain age.
Actually, it is usually much more dangerous not to. Physical activity such as walking, dancing, or gardening for 30 minutes a day can have big benefits. If you have not been exercising at all for years, start slowly. Begin with even a minute or two of exercise and build up by a minute each time. Always ask your healthcare provider about any exercise plans you may have, especially if you have a medical condition.