section 1. Biology of aging -- section 2. Diagnostics and primary assessment -- section 3. The genitourinary system -- section 4. Sexual dysfunction -- section 5. Endocrine system -- section 6. Aging and body composition -- section 7. Nutrition, digestion and metabolism -- section 8. Cardiovascular and respiratory system -- section 9. Central nervous system and psyche -- section 10. Skeletal system -- section 11. Sensory organs -- section 12. Skin and hair.