Aging is often accompanied by a decrease in balance and mobility performance, which frequently leads to fear of falling and reduced physical activity. As a consequence, a further decline in physical health can occur associated with a higher risk of falls and hospitalization [1]. To be able to assist in maintaining healthy independent mobility and living, objective methods for early identification and monitoring of older persons at risk of (further) developing mobility problems are needed. A feasible option is the use of wearable movement sensors to assess daily physical activity and gait.