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This overview summarizes the age dating methods available for young sub-solarmass stars. Pre-main sequence age diagnostics include the Hertzsprung-Russell(HR) diagram, spectroscopic surface gravity indicators, and lithium depletion;asteroseismology is also showing recent promise. Near and beyond the zero-agemain sequence, rotation period or vsini and activity (coronal andchromospheric) diagnostics along with lithium depletion serve as age proxies.Other authors in this volume present more detail in each of the aforementionedareas. Herein, I focus on pre-main sequence HR diagrams and address thequestions: Do empirical young cluster isochrones match theoretical isochrones?Do isochrones predict stellar ages consistent with those derived via otherindependent techniques? Do the observed apparent luminosity spreads at constanteffective temperature correspond to true age spreads? While definitive answersto these questions are not provided, some methods of progression are outlined.

Age-Related Observations of Low Mass Pre-Main and Young Main Sequence Stars (Invited Review)