Background and Objectives: To improve the understanding of ageism toward older people in the context of climate change, the present study developed and validated a new measure that examines the perceived negative and positive contributions of older people to climate change impact, mitigation, and adaptation efforts. Research Design and Methods: = 774) were conducted to develop a new measure and evaluate its reliability and validity, relying on exploratory factor analysis, reliability analysis, confirmatory factor analysis, multiple-group analysis (Australia and India), discriminative validity, and convergent and divergent validity. Results: A 2-subscale measure covering older people's perceived negative contribution to climate change effects (5 items) and perceived positive contribution to adaptation and mitigation measures (3 items; eg, negative, and positive ageism in the context of climate change) was supported by the data. The measure has demonstrated adequate validity and reliability. Discussion and Implications: The measure highlights a relatively neglected area in current climate change discourse and may assist in identifying ways to improve intergenerational solidarity as part of climate change adaptation and mitigation efforts toward building a world for all ages under a healthy climate, which allows for healthy aging and healthy longevity. These objectives are in line with the current mission posed by the UN Decade of Healthy Ageing.
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