The primary goal of the thesis is to determine the differences in the level of selected motor and functional abilities, while the secondary goal of the work is to determine the differences in the performance of weightlifting techniques by evaluation between Croatian wrestling national team members of different ages (U-15) and (U-17). 40 subjects participated in the research, who were divided into two groups. The first group consisted of 20 wrestlers in the cadet category (U-17), and the second group consisted of 20 wrestlers in the category of older boys (U-15) of the Greco-Roman style of wrestling. Both groups were tested with 15 different tests for the assessment of motor and functional abilities, in these 15 tests explosive power of the jumping type, explosive power of the sprint type, repetitive power, specific coordination, specific endurance, flexibility and evaluations of motor skills were tested. The applied tests have good metric characteristics and are proven W. Staroste tests that have been used for almost 40 years. After the analysis, the results were presented, and basic descriptive parameters were used to describe the results: arithmetic mean (M), standard deviation (SD), minimum (MIN), maximum (MAX) and indicators of distribution parameters (skewness, kurtosis). Checking the symmetry (skewness) and flattening (kurtosis) shows that the distributions of these variables are slightly asymmetric, but these deviations are objectively negligible. The difference between the two samples of subjects was determined using the T-test, and the Kolmogorov-Smirnov test to check the normality of the distribution. Based on the conducted research, it can be concluded that older wrestlers (cadets) achieved better results in the majority of selected tests of motor and functional abilities, which we can attribute primarily to their biological development and training level, which enables them to train better and develop different abilities better.