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Published online by Cambridge University Press: 07 August 2017
The determination of the age of stellar populations in progressively more distant stellar systems requires successive calibrations which in some way remind the procedures followed in determining astronomical distances. A few exemplifications of this Age Ladder are schematically reviewed, such as the determination of the age of galactic globular clusters, of the youngest population in bulges and ellipticals, and of the most distant, high redshift radiogalaxies.