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. It is important to pick an activity that you like, for you are more likely to use it. 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 daily and build up by a minute each day.