  This overview summarizes the age dating methods available for young sub-solar
mass 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-age
main sequence, rotation period or vsini and activity (coronal and
chromospheric) diagnostics along with lithium depletion serve as age proxies.
Other authors in this volume present more detail in each of the aforementioned
areas. Herein, I focus on pre-main sequence HR diagrams and address the
questions: Do empirical young cluster isochrones match theoretical isochrones?
Do isochrones predict stellar ages consistent with those derived via other
independent techniques? Do the observed apparent luminosity spreads at constant
effective temperature correspond to true age spreads? While definitive answers
to these questions are not provided, some methods of progression are outlined.
