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Since Protostars and Planets VI (PPVI), our knowledge of the globalproperties of protoplanetary and debris disks, as well as of young stars, hasdramatically improved. At the time of PPVI, mm-observations and optical tonear-infrared spectroscopic surveys were largely limited to the Taurusstar-forming region, especially of its most massive disk and stellarpopulation. Now, near-complete surveys of multiple star-forming regions coverboth spectroscopy of young stars and mm interferometry of their protoplanetarydisks. This provides an unprecedented statistical sample of stellar masses andmass accretion rates, as well as disk masses and radii, for almost 1000 youngstellar objects within 300 pc from us, while also sampling differentevolutionary stages, ages, and environments. At the same time, surveys ofdebris disks are revealing the bulk properties of this class of more evolvedobjects. This chapter reviews the statistics of these measured global star anddisk properties and discusses their constraints on theoretical modelsdescribing global disk evolution. Our comparisons of observations totheoretical model predictions extends beyond the traditional viscous evolutionframework to include analytical descriptions of magnetic wind effects. Finally,we discuss how recent observational results can provide a framework for modelsof planet population synthesis and planet formation.

Demographics of young stars and their protoplanetary disks: lessons learned on disk evolution and its connection to planet formation