Here's the sketch:
  
  Chen et al. (2005; ApJ 623, 493) have shown that among ~solar-mass
  members of the Sco-Cen subgroups (ages ~5-20 Myr), there appears to be an
  interesting anti-correlation between X-ray luminosity and 24um excess.
  The conclusion was drawn from a representive sample of ~40 objects in one
  stellar association, so naturally one would like to know whether this
  anti-correlation exists elsewhere -- and if so, why?
  We have the data to make this plot for other stellar groups, and for the
  FEPS field stars (although the activity-age correlation may conspire to
  produce an activity-disk *correlation*?).

  Step 1: compile logLx and logLx/Lbol data
  Step 2: compile logLir/Lbol data
  Step 3: make plot for various subsamples of FEPS stars
  Step 4: test statistical significance of correlations (accounting for
	  upper limits when necessary).
  Step 5: Look for explanation - physics?!