The distribution of open clusters in the Galaxy plane has been studied taking advantage of recent data. It is shown that clusters have a tendency to be localized in Galactic longitudes 120°-300° which coincide with the direction of Magellanic Clouds and Magellanic Stream. Two age peculiarities of the spatial distribution of open clusters are given. The dependence of linear diameters in their distance from the Galaxy centre is discussed. A supposition is made about the necessity to correct parameters of the zero-age main sequence for objects of early spectral classes and of interstellar absorption.