Charles Eugster is 93 years old, and says you can rebuild your body at any age. Obesity can cause diabetes, heart disease, and cancer. The world population is about 7 billion, almost 8 billion according to Mr. Eugster. By 2030 50% of the US population will be obese. Inactivity is a major cause of death. 3 facts to successful aging, work, diet, and exercise. Competition gives adrenaline rushes. Don’t be a calamity when you retire, pay attention to your health.