Which field focuses on the aged and the treatment of related diseases?

The field that primarily focuses on the aged and the treatment of related diseases is geriatrics. Geriatrics is a branch of medicine that specifically addresses the healthcare needs of older adults, including the prevention, diagnosis, and treatment of age-related conditions. It encompasses a wide range of issues associated with aging, such as chronic diseases, functional decline, and mental health concerns.

While gerontology is related and encompasses the study of aging from a broader perspective, including social, psychological, and environmental aspects, it does not specifically focus solely on the medical treatment of the aged. Therefore, the consideration of both geriatrics and gerontology together reflects a more comprehensive understanding of aging, but it is geriatrics that directly pertains to the medical management of elderly patients and their diseases.

Endocrinology and neurology, on the other hand, are specialized fields that focus on specific systems within the body rather than on the aging population as a whole. Endocrinology deals with hormone-related diseases and conditions, while neurology focuses on the nervous system and related disorders.