Old Age Deferred: The Causes of Old Age and Its Postponement by Hygienic and Therapeutic Measures is a groundbreaking medical treatise authored by Dr. Arnold Lorand, first published in the early 20th century. This comprehensive work explores the biological, physiological, and environmental factors that contribute to the aging process, offering a detailed analysis of how old age can be delayed through scientific and practical interventions. Drawing upon the latest research of his time, Dr. Lorand examines the roles of the endocrine glands, nutrition, exercise, mental health, and lifestyle choices in maintaining vitality and prolonging life. The book delves into the mechanisms of senescence, discussing how the decline of certain bodily functions and organs leads to the symptoms commonly associated with aging. Dr. Lorand emphasizes the importance of preventive medicine, advocating for regular medical check-ups, balanced diets, and the avoidance of harmful habits such as excessive alcohol consumption and sedentary living. He also highlights the significance of mental stimulation, social engagement, and emotional well-being in preserving youthfulness. Old Age Deferred is notable for its forward-thinking approach, suggesting that aging is not an inevitable decline but a condition that can be managed and mitigated. The author provides practical advice on daily routines, hygiene, and therapeutic measures, including the use of hormone therapy, to support the body's natural defenses against aging. With its blend of scientific insight and accessible guidance, the book serves as both a medical reference and a self-help manual for those seeking to extend their healthy years. Rich in historical context and medical wisdom, Old Age Deferred remains a valuable resource for readers interested in the science of longevity, the history of gerontology, and the pursuit of a longer, healthier life.