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The evolution and lifetimes of thermally pulsating asymptotic giant branch(TP-AGB) stars suffer from significant uncertainties. We present a detailedframework for constraining model luminosity functions of TP-AGB stars usingresolved stellar populations. We show an example of this method that comparesvarious TP-AGB mass-loss prescriptions that differ in their treatments of massloss before the onset of dust-driven winds (pre-dust). We find that models withmore efficient pre-dust driven mass loss produce results consistent withobservations, as opposed to more canonical mass-loss models. Efficient pre-dustdriven mass-loss predicts for [Fe/H] < -1.2, lower mass TP-AGB stars (M < 1Msun) must have lifetimes less than about 1.2 Myr.

Constraining Mass-Loss & Lifetimes of Low Mass, Low Metallicity AGB Stars