This chapter describes changes in the age demographic of the American populace that will steadily increase the number of elderly people in the United States for the next 30 years, and examines the relationship among aging, health, and disability. It provides the characteristics and needs of people who have frequently occurring aging-related disabling conditions such as dementia, rheumatoid arthritis, and stroke. The most common chronic health conditions for people over the age of 65 include arthritis, hypertensive disease, heart disease, hearing impairments, musculoskeletal impairments, chronic sinusitis, diabetes, and visual impairments. It is important for rehabilitation counselors to understand the impact that population aging has had and will continue to have on family interaction and socialization, the American economy, and human health care and social service systems. In providing counseling and guidance services to individuals with age-related disabilities, the issue of chronicity is often of paramount concern.