Comparison of the correlations between age and [α/Fe] for two very different types of astrophysical objects. Upper left panel: the luminosity-weighted average properties of early-type galaxies from W15. The solid line is a formal fit to the two regimes, separated at 9 Gyr. Upper right panel: stars in the local neighborhood from B14 (solid squares) and H13 (stars). The dashed line is a formal fit to the B14 data for the two regimes, separated at 9 Gyr. The solid line repeats the fit for galaxies from the left panel. Lower left panel: the luminosity-weighted average properties of early-type galaxies in the semi-analytic model of Y13. The solid line repeats the fit for the W15 data for comparison. No observational errors have been added to the model galaxy properties, which largely explains the difference in scatter. Lower right panel: single-star properties for a simulated solar neighborhood from M13. The dashed line repeats the fit to the B14 data for comparison. Here, observational errors have been added for better comparison of scatter.