  The high quality spectra required for radial velocity planet searches are
well-suited to providing abundances for a wide array of elements in large
samples of stars. Abundance ratios of the most common elements relative to Fe
are observed to vary by more than a factor of two in planet host candidates.
This level of variation has a substantial impact on the evolution of the host
star and the extent of its habitable zone. We present stellar models of 1 solar
mass stars with custom compositions representing the full range of these
non-solar abundance ratios. We find that the effects derived from variation
over the observed range of [O/Fe] are particularly dramatic. Habitability
lifetimes for some classes of orbits can vary by gigayears for the observed
range in [O/Fe].
