This study aim to characterize the cracking process of concrete and to deepen understanding of its behavior at different stage of maturation. Acoustic emission technique as a non-destructive method was used to monitor crack propagation in real time during three points bending tests. Mechanical energy and activity acoustic at 28 days, 6 months and 12 months during bending test was studied. It’s found that younger mature concrete (28 days) showed a more sudden and concentrated release of energy, with intense acoustic events occurring over a short period, indicating more abrupt fracture. In contrast, more mature concrete exhibited more gradual and gradual crack propagation, reflecting greater strength and a more uniform distribution of internal stresses. The results demonstrate an excellent correlation between dissipated mechanical energy and recorded acoustic activity, thus validating the reliability of this monitoring method. This correlation offers a promising, non-invasive approach to assess the structural integrity of concrete in real-life applications, enabling early damage detection and optimization of maintenance of reinforced concrete structures.