The use of a 5-level categorical activity profile variable may allow more complex analyses of activity that capture the "whole person." There is clearly a vulnerable group of low-activity individuals as well as a High Activity group that may represent the "active ageing" vision.

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Potential exists for social theories of aging to be applied to the experience of aging with physical impairment. To do so, physical impairment and disability must be clearly operationalized. The author suggests using social models of disability as frameworks in this process and provides examples of how this might be done with current social theories of aging.

The nature of engagement may play a more important role than the activity itself in relation to health. Identifying the heterogeneity in activity engagement in later life is critical for tailoring interventions and designing programs that can improve the health of older adults.

Persons aging with long-term disabilities such as spinal cord injury or multiple sclerosis and older adults share similar chronic conditions in mid and later life in the United States. The rising general interest and more prevalent federal requirements for use of evidence-based practices (EBP) in health promotion and chronic condition interventions highlight the gap between demand and the availability of EBPs for persons aging with disability in particular. Addressing this gap will require focused efforts that will benefit substantially by bridging the fields of aging and disability/rehabilitation to develop new EBPs, translate existing EBPs across populations, and borrow best practices across fields where there are few current EBPs. Understanding distinctions between disability-related secondary conditions and age-related chronic conditions is a first step in identifying shared conditions that are important to address for both mid-life and older adults with disabilities. This review articulates these distinctions, describes shared conditions, and discusses the current lack of EBPs for both populations. It also provides recommendations for bridging activities in the United States by researchers, professionals, and consumer advocates. We argue that these can more efficiently move research and practice than if activities were undertaken separately in each field (aging and disability/rehabilitation).