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We describe Spitzer/MIPS observations of the double cluster, h and $\chi$Persei, covering a $\sim$ 0.6 square-degree area surrounding the cores of bothclusters. The data are combined with IRAC and 2MASS data to investigate $\sim$616 sources from 1.25-24 $\mu m$. We use the long-baseline $K_{s}$-[24] colorto identify two populations with IR excess indicative of circumstellarmaterial: Be stars with 24 $\mu m$ excess from optically-thin free freeemission and 17 fainter sources (J$\sim$ 14-15) with [24] excess consistentwith a circumstellar disk. The frequency of IR excess for the fainter sourcesincreases from 4.5 $\mu m$ through 24 $\mu m$. The IR excess is likely due todebris from the planet formation process. The wavelength-dependent behavior isconsistent with an inside-out clearing of circumstellar disks. A comparison ofthe 24 $\mu m$ excess population in h and $\chi$ Per sources with results forother clusters shows that 24 $\mu m$ emission from debris disks 'rises' from 5to 10 Myr, peaks at $\sim$ 10-15 Myr, and then 'falls' from $\sim$ 15/20 Myr to1 Gyr.

The Rise and Fall of Debris Disks: MIPS Observations of h and chi Persei and the Evolution of Mid-IR Emission from Planet Formation