Anchorage systems play a critical role in transferring loads in concrete structures, particularly under shear loading conditions near free edges. While the shear behavior of anchors has been extensively investigated through experimental studies, direct observation of fracture processes and anchor-concrete interaction mechanisms remains challenging. Consequently, current design approaches rely largely on empirical formulations, offering limited insight into the influence of concrete heterogeneity, age-dependent material properties, and geometric parameters such as edge distance. In this study, the Lattice Discrete Particle Model (LDPM) is employed to numerically investigate the shear response of cast-in bonded anchors embedded in concrete. The objective is to assess the capability of LDPM to accurately reproduce the anchor shear behavior and to systematically analyse the effects of concrete type, concrete age, and edge distance on shear capacity and failure mechanisms. Data from a comprehensive numerical campaign is reviewed considering three normal-strength concretes with different aggregate types, two concrete ages, and three edge distances for each configuration. The LDPM framework explicitly represents concrete heterogeneity and meso-scale fracture processes, allowing a detailed investigation of crack initiation, propagation, and localized damage development around the anchor under shear loading. The numerical simulations yield load-displacement responses and evolving crack patterns that are consistent with experimentally observed trends. The results demonstrate a clear dependence of shear capacity and failure mode on edge distance, concrete age, and material strength. In particular, reduced edge distances lead to pronounced concrete breakout and asymmetric crack propagation, while increased concrete maturity enhances load resistance and alters fracture localization.