The present article aims to examine the age-related changes in the basic characteristics important for biomechanics (body height and body weight) of Bulgarian men. We do this after dividing the measured individuals into two age groups: I) 18-25 years and II) 30-40 years. The data used in the investigation were collected by performing our own anthropometric measurements. In group I) we measured 41 men and in group II) – 44 men. We present the mean values, standard deviations, and minimal and maximal values of the height, weight, and body mass index of each of the groups, as well as the corresponding probability distributions of these characteristics. The obtained results can be used when there is a need for such anthropometric and mass parameters, e.g., in problems related to the biomechanics of human movements, ergonomics, rehabilitation, orthopaedics and traumatology, sports, forensic studies, etc.