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Recent improvements in the age dating of stellar populations and single starsallow us to study the ages and abundance of stars and galaxies withunprecedented accuracy. We here compare the relation between age and\alpha-element abundances for stars in the solar neighborhood to that of local,early-type galaxies. We find both relations to be very similar. Both fall intotwo regimes with a flat slope for ages younger than ~9 Gyr and a steeper slopefor ages older than that value. This quantitative similarity seems surprising,given the different types of galaxies and scales involved. For the sample ofearly-type galaxies we also show that the data are inconsistent with literaturedelay time distributions of either single or double Gaussian shape. The dataare consistent with a power law delay time distribution. We thus confirm thatthe delay time distribution inferred for the Milky Way from chemical evolutionarguments also must apply to massive early-type galaxies. We also offer atentative explanation for the seeming universality of the age-[\alpha/Fe]relation as the manifestation of averaging of different stellar populationswith varying chemical evolution histories.

Self-similarity in the chemical evolution of galaxies and the delay time distribution of SNe Ia