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We present recent progress on quantitative estimation of stellar ages usingind icators such as theoretical evolutionary tracks, rotation, rotation-drivenchrom ospheric and coronal activity, and lithium depletion. Our focus is onroughly so lar-mass and solar-metallicity stars younger than the Sun. Weattempt to charac terize the systematic and random error sources and thenderive "best" ages alo ng with the dispersion in age arising among the variousage estimation methods. Our main application of these techniques is to theevolution of debris disks.

Stellar Age Estimation from ~3 Myr to ~3 Gyr