The societal effects of the aging society are one of the biggest challenges in the Western world. Growing old is often accompanied by multi- and co-morbidities, such as hypertension, diabetes, or arthritis, but also age-related problems, such as loss of muscle mass, walking instabilities, and more. As a consequence, the need for care and dependency on other people increases. In conjunction with the ongoing demographic change of population and medical needs related to older age, there is an increasing shortage of healthcare workers which is estimated to worsen in the next years. In order to...