Groundwater age modeling helps us understand how water moves through different layers underground. By studying how old water is in different parts of an aquifer, we can learn about its history and how it flows. In this study, researchers used computer simulations to show how water age changes in areas with different levels of permeability. They found that areas with low permeability help water circulate deeper underground. Additionally, they discovered that water mixing and dispersion are important factors in modeling groundwater age in large underground water systems. This research can help us better manage and protect our groundwater resources on a regional scale.