The proposed study using rTMS will build upon the investigators previous work demonstrating the link between cognitive impairment, particularly executive dysfunction, and mobility/gait abnormalities in older adults, even in those labeled as "cognitively normal". Emerging evidence demonstrates that executive dysfunction is an early phenomenon in the pathway to mobility disability and subtle changes in executive function are independently associated with future falls. The investigators have piloted studies showing that pharmacological enhancement of executive function, can improve gait-motor performance and, potentially, reduce mobility decline and risk of falls. This supports the rationale for a promising intervention: enhancing cognition to prevent mobility decline and reduce risk of falls. The long-term goal is to create a clinical research program to apply rTMS as an early novel intervention for cognitive/motor interaction to ultimately delay the onset of cognitive and mobility disabilities and their devastating consequences, dementia and falls, in older adults. However, it is first necessary to study a smaller group of seniors to plan for recruitment, study retention and compliance, and to gather preliminary data as proof of principle before proceeding to a larger clinical trial.