  We are developing a brand new stellar population models with flexible
chemistry (isochrones plus stellar colors and spectra) in order to set a new
standard of completeness and excellence. Here we present preliminary results to
assess the effects of stellar evolution models and stellar model atmosphere to
the well-known Lick indices at constant heavy element mass fraction Z that
self-consistently account for varying heavy element mixtures. We have enhanced
chemical elements one by one. Our ultimate goal is to demonstrate 10% absolute
mean ages for a sample of local galaxies derived from an integrated light
spectrum.
