According to the World Health Organization (WHO, 2013, 2017), physical inactivity is identified as the fourth leading risk factor for global mortality. WHO (2017) and the USA Department of Health and Human Services (2018) reports say risk reductions routinely occur with moderate-intensity aerobic physical activity (PA) levels of at least 150-300 minutes per week or, at least 75-150 minutes of vigorous-intensity aerobic throughout the week; balance training and fall prevention and muscle- strengthening activities. When seniors cannot do the recommended amounts of PA due to health conditions, they should try as much as their abilities and conditions allow. One of the ways to stimulate the practice of PA is the use of safe and easily accessible outdoor public spaces. An increasingly popular strategy is the installation of outdoor gyms. A systematic review was conducted to know the senior users profile of these facilities. An exhaustive scientific literature review was made on research databases (Web of Science -all databases-, Scopus, SportDiscus, CINAHL, Cochrane Library Plus, PubMed, Proquest Dissertations and Theses, and Google Scholar). 17,035 results were gathered, and only 22 studies met the selection criteria. The highest frequency of OGs older users are female; married; with medium income, high school, live close to OGs and physically active on leisure time. They use the OGs between three to five times per week and, the percentage of elderly people observed is very low. Curiously, their perceived health is good, but they are overweight or obese, they are medicated and many users suffer from chronic diseases.