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The Galactic bulge is dominated by an old, metal rich stellar population. Thepossible presence and the amount of a young (a few Gyr old) minor component isone of the major issues debated in the literature. Recently, the bulge stellarsystem Terzan 5 was found to harbor three sub-populations with iron contentvarying by more than one order of magnitude (from 0.2 up to 2 times the solarvalue), with chemical abundance patterns strikingly similar to those observedin bulge field stars. Here we report on the detection of two distinct mainsequence turn-off points in Terzan 5, providing the age of the two main stellarpopulations: 12 Gyr for the (dominant) sub-solar component and 4.5 Gyr for thecomponent at super-solar metallicity. This discovery classifies Terzan 5 as asite in the Galactic bulge where multiple bursts of star formation occurred,thus suggesting a quite massive progenitor possibly resembling the giant clumpsobserved in star forming galaxies at high redshifts. This connection opens anew route of investigation into the formation process and evolution ofspheroids and their stellar content.

The age of the young bulge-like population in the stellar system Terzan5: linking the Galactic bulge to the high-z Universe