This project studies aging-effects on human spatial navigation behavior and their underlying neural correlates in the brain’s spatial navigation network. Specifically, this project aims to assess aging-related deficits in complex, multi-goal, naturalistic navigational behavior and their associations to the connectivity and plasticity of the brain’s navigation network, specifically of the pathway between the hippocampus and the prefrontal cortex, using concurrent TMS-fMRI. Eligibility: 1) No history of musculoskeletal impairment, neurologic disease, major head trauma, epilepsy, or seizures. 2) No major psychiatric disorder, sleep disorder, or chronic fatigue. 3) No major visual impairments that are uncorrected (if corrected, must be VR-compatible). 4) Right handed 5) Within the specified age ranges for each age group (age: 18-35 years; age: 60+); (6) at least an 8th grade education; fluent in English .