What Are Geriatrics?

Geriatrics are the medical practices and clinical disciplines focused on the health care of older adults, encompassing the prevention, diagnosis, and treatment of diseases and disabilities that arise with aging. Physicians who specialize in these practices, called geriatricians, complete additional fellowship training beyond internal medicine or family medicine to develop expertise in the unique physiology of older adults, the management of multiple simultaneous chronic conditions, and the functional and cognitive dimensions of aging. The specialty recognizes that older patients often present atypically: infections may manifest without fever, cardiac events without chest pain, and delirium may signal a serious underlying illness before other signs appear.

The field draws on gerontology, the scientific study of aging processes at the biological, psychological, and social levels, as well as pharmacology, neurology, and rehabilitation medicine. Age-related changes in renal clearance, hepatic metabolism, and body composition alter how medications are absorbed, distributed, and eliminated, making polypharmacy management a central geriatric skill. The American Geriatrics Society establishes clinical practice guidelines and educational standards for geriatric medicine in the United States, including the Beers Criteria, a widely referenced list of medications that carry elevated risk in older adults.

Gerontology and the Biology of Aging

Gerontology provides the biological and epidemiological foundation on which geriatric clinical practice rests. Research in this domain investigates mechanisms of cellular senescence, telomere biology, inflammaging (the chronic low-grade inflammation associated with aging), and the role of stem cell exhaustion in organ deterioration. Longitudinal cohort studies, including the Baltimore Longitudinal Study of Aging and the English Longitudinal Study of Ageing, have traced the trajectories of physical, cognitive, and social function across the adult lifespan, yielding normative data that clinicians use to identify pathological decline. The Johns Hopkins Division of Geriatric Medicine and Gerontology Biology of Healthy Aging Program investigates the molecular mechanisms that distinguish normal aging from age-related disease. Understanding these mechanisms informs both pharmaceutical targets and lifestyle interventions aimed at compressing morbidity into a shorter period before death.

Clinical Assessment and Geriatric Syndromes

A distinctive feature of geriatric medicine is the comprehensive geriatric assessment (CGA), a structured multi-domain evaluation of medical, functional, cognitive, and social status that guides individualized care planning for older patients. Geriatric syndromes are clinical conditions common in older adults that do not fit neatly into single-organ disease categories. These include frailty, delirium, falls, urinary incontinence, pressure ulcers, and malnutrition. Falls receive particular attention because they are the leading cause of injury-related death in adults over 65, and their occurrence typically reflects the convergence of multiple contributing factors including muscle weakness, postural hypotension, cognitive impairment, and environmental hazards. Fall detection systems using wearable accelerometers and pressure-sensitive flooring have been developed to enable rapid response when falls occur, and fall prevention programs combining exercise, medication review, and home modification have demonstrated effectiveness in controlled trials.

Applications

Geriatrics has applications in a wide range of disciplines, including:

• Assisted living facility care planning and management
• Fall detection and prevention using wearable sensors and smart-home technology
• Dementia care, including assessment and behavioral management strategies
• Palliative and end-of-life care for patients with serious illness
• Rehabilitation following hip fracture, stroke, and major surgery
• Telehealth and remote monitoring for homebound older adults
• Medication safety and deprescribing programs in nursing homes