Evolution of the IR excesses (f_disk) for A- and F-type stars in our sample. Targets with debris disks detected using SPHERE instruments are shown as filled circles. The blue solid line represents a fit to the A-type star sub-sample, the red dashed line to the F-type star subsample, and the black dash-dotted line indicates the expected decline of IR excess for debris disks evolving in a steady-state collisional regime. The blue- and red-shaded regions indicate the 68% and 95% confidence bands for the fits to the A-type and F-type star subsamples, respectively.