It is relatively normal for a seventy year old to still have 20 teeth. 1. According to the oral health standards for the elderly set by the World Health Organization, it is usually normal for a seventy-year-old to have 20 teeth. 2. The elderly in life should pay attention to oral health care, try to avoid eating difficult to chew or more hard food, but also to supplement vitamins, calcium and other nutrients, to avoid the phenomenon of osteoporosis leading to tooth loss. Seventy-year-olds have how many teeth normal is not absolute, as long as you maintain healthy habits, regular medical checkups, to ensure the health of the body can be.