biostudies-literatureHayek RNIA NIH HHSglaf205https://www.ebi.ac.uk/biostudies/studies/S-EPMC12596487biostudies-literatureUnknown80(12)<h4>Background</h4>Mobility decline often begins in midlife, and early identification of individuals at risk of accelerated deterioration can enable timely prevention. However, there is no validated self-report instrument that specifically assesses mobility in the middle-aged population.<h4>Methods</h4>The Mobility in Middle-Age Questionnaire (MMQ) was developed through a 7-step Delphi process, consisting of 10 experts, involving item selection and content validation in both English and Hebrew, comprising 2 factors: (1) Current Mobility Ability and (2) 1-Year Mobility Change. Psychometric properties were assessed in 610 US and 594 Israeli middle-aged adults. Analyses included internal consistency, test-retest reliability, structural and construct validity (using the 10-item Physical FunctiThe journals of gerontology. Series A, Biological sciences and medical sciencesDevelopment and validation of the mobility in middle-age questionnaire.PMC12596487R01 AG071730Covinsky KHoffman JRNudelman YSaad OHayek RSpringer SKrautner GBrown RTBean JFYogev-Seligmann GKarvonen-Gutierrez CAAzmon MGuralnik JMfalseDevelopment and validation of the mobility in middle-age questionnaire.<h4>Background</h4>Mobility decline often begins in midlife, and early identification of individuals at risk of accelerated deterioration can enable timely prevention. However, there is no validated self-report instrument that specifically assesses mobility in the middle-aged population.<h4>Methods</h4>The Mobility in Middle-Age Questionnaire (MMQ) was developed through a 7-step Delphi process, consisting of 10 experts, involving item selection and content validation in both English and Hebrew, comprising 2 factors: (1) Current Mobility Ability and (2) 1-Year Mobility Change. Psychometric properties were assessed in 610 US and 594 Israeli middle-aged adults. Analyses included internal consistency, test-retest reliability, structural and construct validity (using the 10-item Physical Functi2025-01-01T00:00:00Z2025 Nov2026-06-06T13:28:28.664Z2026-05-31T03:07:19.758ZS-EPMC125964874101764210.1093/gerona/glaf205