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English: Fraction of stars in stellar clusters and associations of various ages (in millions of years) showing spectroscopic or photometric evidence of having a protoplanetary disk. From review by E. Mamajek (2009) in EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY: Proceedings of the International Conference. AIP Conference Proceedings, Volume 1158, pp. 3-10."Initial Conditions of Planet Formation: Lifetimes of Primordial Disks"
{{Information |Description={{en|1=Fraction of stars in stellar clusters and associations of various ages (in millions of years) showing spectroscopic or photometric evidence of having a protoplanetary disk. From review by E. Mamajek (2009) in EXOPLANETS A