The aim of the review was to find the factors correlated to the state of mental and physical health of the elderly as well as the factors, behaviours and activities that can be influenced and potentially modified. We performed an analysis of results of research conducted in many places all across the world among the persons after the age of 50. The results of this research indicate a significant role of physical activity in functioning of the elderly. They show how it influences their performance of everyday activities, their mood and health. We discuss the research taking into account the diagnostic tools used, the interventions performed and their effectiveness.