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We propose 35 star systems within ~70 pc of Earth as newly identified membersof nearby young stellar kinematic groups; these identifications include thefirst A- and late-B type members of the AB Doradus moving group and field ArgusAssociation. All but one of the 35 systems contain a bright solar- orearlier-type star that should make an excellent target for the next generationof adaptive optics (AO) imaging systems on large telescopes. AO imaging hasrevealed four massive planets in orbit around the {\lambda} Boo star HR 8799.Initially the planets were of uncertain mass due in large part to the uncertainage of the star. We find that HR 8799 is a likely member of the ~30 Myr oldColumba Association implying planet masses ~6 times that of Jupiter. Weconsider Spitzer Space Telescope MIPS photometry of stars in the ~30 Myr oldTucana/Horologium and Columba Associations, the ~40 Myr old field ArgusAssociation, and the ~70 Myr old AB Doradus moving group. The percentage ofstars in these young stellar groups that display excess emission above thestellar photosphere at 24 and 70 \mu m wavelengths - indicative of the presenceof a dusty debris disk - is compared with corresponding percentages for membersof 11 open clusters and stellar associations with ages between 8 and 750 Myr,thus elucidating the decay of debris disks with time.

The Tucana/Horologium, Columba, AB Doradus, and Argus Associations: New Members and Dusty Debris Disks