Published every two years, Government at a Glance provides reliable, internationally comparable indicators on government activities and their results in OECD countries. Where possible, it also reports data for selected non-member countries. It includes input, process, output and outcome indicators as well as contextual information for each country.
It also looks at the average age of cabinet ministers.
https://www.oecd-ilibrary.org/governance/government-at-a-glance-2023_3d5c5d31-en
https://www.oecd-ilibrary.org/docserver/3d5c5d31-en.pdf