Purpose: The International University Sports Federation, which includes swimming in its Summer World University Games, has received the University Games World Championship title since 1959. Swimming has been presented at the 1st Universiade since 1959, to date 30 have been held. The purpose of this study is to determine the indicators of swimming skills among men and women of different ages at 14 World Swimming Universities in Stage І (1959-1991), and among 14 facts Swimming World Universiade in Stage ІІ (1993-2019). Material: The results of the swimmers-finalists were summarized and analyzed for Stage І among 538 men and 456 women and for Stage ІІ, among 828 men and 816 women. Results: The formation dynamics of swimming athletic skills for various marathon distances for different age groups were identify for men and women and the total significant difference in average speed indicators for all distances for men and women were determined. The formation dynamics of physical swimming skills for various marathon distances for different age groups are presented in detail and significant differences in the average swimming speed for all marathon distances are determined. Conclusions: The obtained results will make a significant scientific and methodological contribution to the further improvement of physical education and sports in a gender approach in the process of training and improvement evaluation of youth in the physical education and sport. This can motivate the youth to achieve better swimming result at prestigious competitions, which are the summer swimming marathons at all World University Games, Stage I and II. This study presents the details of the past and present state development of trends in athlete skills formation among swimmers of all ages and gender over a long period of time: from birth, development and stabilization of the ability to properly and reliably improve to the level of prestigious competitions.