  We used chromospheric activity to determine the ages of 2,820 field stars..
We searched these stars for excess emission at 22 um with the Wide-Field
Infrared Survey Explorer. Such excess emission is indicative of a dusty debris
disk around a star. We investigated how disk incidence trends with various
stellar parameters, and how these parameters evolve with time. We found 22 um
excesses around 98 stars (a detection rate of 3.5%). Seventy-four of these 98
excess sources are presented here for the first time. We also measured the
abundance of lithium in 8 dusty stars in order to test our stellar age
estimates.
