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We report on our continued efforts to understand and delineate the magneticdynamo-induced behavior/variability of red dwarf (K5 V - M6 V) stars over theirlong lifetimes. These properties include: rotation, light variations (from starspots), coronal-chromospheric XUV activity and flares. This study is beingcarried out as part of the NSF-sponsored Living with a Red Dwarf program. TheLiving with a Red Dwarf program's database of dM stars with photometricallydetermined rotation rates (from starspot modulations) continues to expand, asdoes the inventory of archival XUV observations. When all data sets arecombined with ages from cluster/population memberships and kinematics, thedetermination of Age-Rotation-Activity relationships is possible. Suchrelationships have broad impacts not only on the studies of magnetic dynamotheory & angular momentum loss of low-mass stars with deep convective zones,but also on the suitability of planets hosted by red dwarfs to support life.With intrinsically low luminosities (L < 0.02L_sun), the liquid water habitablezones (HZs) for hosted planets are very close to their host stars - typicallyat ~0.1-0.4 AU. Planets located close to their host stars risk damage andatmospheric loss from coronal & chromospheric XUV radiation, flares and plasmablasts via strong winds and coronal mass ejections. In addition, ourrelationships permit the stellar ages to be determined through measures ofeither the stars' rotation periods (best way) or XUV activity levels. This alsopermits a determination of the ages of their hosted planets. We illustrate thiswith examples of age determinations of the exoplanet systems: GJ 581 and HD85512 (both with large Earth-size planets within the host star's HZ), GJ 1214(hot, close-in transiting super-Earth planet) and HD 189733 (short period,hot-Jupiter planet interacting with its host star - age from its dM4 starcompanion).

Red Dwarf Stars: Ages, Rotation, Magnetic Dynamo Activity and the Habitability of Hosted Planets