<p>Chalcogenide glasses are highly preferred for their applications in mid-infrared (mid-IR) optical devices, optoelectronics, and phase-change materials. However, these materials are prone to physical aging over time, which can significantly alter their properties. Studies have been carried out on the structure, thermal profiles, and kinetics of such glasses with aging, but detailed information on structural modifications and their impact on the optical properties remains highly unexplored as the glasses age. Therefore, in this study, the effects of physical aging on the structural and optical properties of Sb₁₀Se₆₅Ge_{25−<i>y</i>}In_<i>y</i> (<i>y</i> = 3, 6, 9, 12, 15) chalcogenide systems over a period of 10 years under ambient conditions were explored. The findings revealed a notable transformation from an amorphous to a crystalline phase in the sample with the highest indium (In) concentration. Optical analysis of aged thin films showed a general decrease in the linear refractive index and an increase in the nonlinear refractive index, attributed to abatement in the optical bandgap when compared with the as-prepared thin films. While samples with In concentrations up to <i>y</i> = 12 exhibited aging behavior similar to the as-prepared glasses, the sample with <i>y</i> = 15 In at. % displayed an anomalous behavior, likely owing to the emergence of crystalline phases over time. These findings emphasize the importance of understanding aging effects for the long-term application of chalcogenide glasses in optoelectronic technologies.</p>