Sticking to fitness when you are young, your body may not be healthier when you are old, and you may not have various sequelae. The specific analysis is as follows.

First, whether you are healthy when you are old depends on physical exercise, nutrition, environment, heredity and other factors. You can't generalize, and fitness will be healthier. Of course, scientific and reasonable fitness is good for your health. If a person wants to be healthier in his later years, scientific exercise is indispensable, nutrition is indispensable, improving the living environment is indispensable, and paying attention to genetic factors is indispensable.

Second, excessive fitness will definitely have sequelae. Running for a long time will definitely damage the knee joint. However, if we can control the intensity of fitness and pay attention to the scientific nature of training, we will only have natural aging in old age and there will be no sequelae of fitness. Don't worry about fitness.