The polarization aging behavior of the Ba0.7Sr0.3Ti0.97Zr0.03O3 ceramic that presents diffuse phase transition, was investigated at different temperatures. The aging of this system is explained by assuming the existence of two different relaxation regimes, one associated with rapidly relaxing polarized macroregions (τ1) and the other to long time relaxing polarized microregions (τ2). With these considerations, a modified expression to describe the aging behavior is proposed, leading to a good fit to the experimental measurements of the polarization. Hysteresis loop, permittivity, and dielectric loss measurements were performed on the samples to support the aging study.