A scalable step count-based predictor of biological age: development and validation of MoveIt! Age in community-dwelling adults and geriatric rehabilitation inpatients - Jessica K. Lu; Weilan Wang; Lihuan Guan; Jeroen van der Velde; Joris Hoeks; Patrick Schrauwen; Gajja S. Salomons; Riekelt H. Houtkooper; Andrea B. Maier; Georges E. Janssens (GeroScience, 2025)