Purpose. Human physical activity is an important component of health and it gains a special significance with age, influencing the quality of life of elderly people. The present study discusses the question of whether the level of physical activity is a sufficient stimulus to evoke positive changes in body composition and bone mineral density in women from the University of the Third Age. Basic procedures. The research was conducted on 90 women aged between 65 and 74, students of the U3A. The subjects were divided into two groups on the basis of the amount of their level of physical activity declared by them in questionnaires (1-2 times a week - low physical activity group; 3 and more times a week - high physical activity group). The following measurements were taken: body weight and body height (on the basis of which the BMI was calculated for each subject), body composition including percent fat and water content as well as the amount of body fat and water, with the aid of Futurex-5000 (NIR technique). Dual-energy X-ray absorptiometry (DXA) was used to measure the bone mineral density (BMD) of the proximal segment of the femoral bone (g/cm2) with the Lunar DPX-plus densitometer. Main findings. Mean, standard deviation and coefficient of variation were applied in the statistical analysis. The differences between the variables were analyzed with Student's t-test. Conclusions. The research results imply the necessity of conducting a systematic and thorough analysis of the lifestyle and quality of life of elderly people.