Spatial and age distribution of the open clusters in CGa20 catalogue and of the 202 open clusters in our final sample. Top panel: spatial distribution of the OCs in the Gaia DR2-based catalogue of CGa20 (points colour-coded by age) and of the 202 OCs in our final sample (points encircled by a black circumference) in heliocentric Cartesian coordinates. The Galactic centre is towards the right. Bottom panel: normalised age distributions for the local OCs in CGa20 (738 OCs with d < 1.5 kpc, olive histogram and kernel-density estimates; 202 of them constitute our final sample of OCs whose membership list is taken from either T22 or CGa20 depending on the age) and for our final sample of 202 OCs (black histogram and kernel-density estimates).