Gerontology is the multidisciplinary study of the aging process and older adults, concerning physical, mental, and social changes between maturity and death. Geriatrics specifically studies health and diseases in later life, aiming to promote health and prevent/treat diseases and disabilities in elderly. The aging process involves cumulative changes in organs and tissues over time due to genetic and environmental factors, leading to decreased function. Key factors include non-functional cell buildup, DNA damage triggering cell death, and reduced antioxidant defenses. Maintaining good nutrition through a moderate diet, social interaction, daily exercise, and relaxation can help elderly attain longer, healthier lives.