Working in foundry manufacturing along with health risk behavior can result in accelerated biological aging in industrial workers. The purpose of the study was to evaluate the biological age in foundry workers and to identify the related factors. Materials and methods. A cross-sectional study was conducted of the foundry workers (all males) having the jobs as follows: moldmakers, iron founders, steelmakers and their helpers, hammer smiths, metal cutters and roll benders. All the obtained data were analyzed in relation with the job positions and the duration of working in harmful conditions (DWHC). In order to evaluate biological age (BA), we analyzed arterial blood pressure (BP), one-leg standing (OLS) test and breath-holding (BH) test performances, and the data of a self-assessment quiz (SAQ). A survey has been conducted to find out if there is any health risk behavior. Results. 133 workers were examined. It was established that in every DWHC group, BA values are reliably higher (p<0.001) than the actual age (AA) values. Among the workers in general, the gap between BA and AA equals 8.38±1.11 years. The correlation analysis has shown that in every group, health indicators vary depending on the DWHC and the working tenure. In hammer smiths, BA raises reliably with the number of years of smoking (r=0.54), the consumption of cigarettes (r=0.64), and body mass index (r=0.51). In moldmakers, BA is affected with low physical activity (0.34) and cigarettes consumption (0.32). Conclusion. The highest BA values are found in steelmakers, roll benders and moldmakers. Low OLS and BH tests results; a rise in complaints on hearing and vision dysfunction, low back pain and joint pain; as well as low resting heart rate are related to the duration of working in harmful conditions and the working tenure.