Mobility limitations, such as difficulty walking or transferring to and from a car, are a common and costly problem affecting older adults. Identifying changes in mobility as early as possible is critical to mitigate or prevent major declines in health and social functioning. Our multidisciplinary team has been funded by the McMaster Institute for Research on Aging (MIRA), AGE-WELL NCE and McMaster Provosts’ Office to study technological approaches for advancing the assessment and management of mobility problems in older adulthood. A key component of our 5-year MIRA project involves the assembly of a large-scale prospective cohort study that will lead to the development of a novel tool (‘the Monitoring My Mobility’ (‘M3’ tool)) for mobility assessment by older adults and their caregivers. We will also create a community-based platform where leading-edge research on mobility and aging will be conducted.