Charles Amédée Simon du Buisson de Courson was born on 2 April 1952, in the 16th arrondissement of Paris.

[4] His father, Aymard de Courson, a Popular Republican Movement (MRP) politician, held the mayorship of Vanault-les-Dames from 1953 to 1985 and represented the canton of Heiltz-le-Maurupt in the General Council of Marne from 1958 to 1985, when he died.

His paternal grandmother, Germaine Charlotte Lhuillier, was deported to Bergen-Belsen concentration camp in Germany amid World War II, where she died in 1945.

In 2023, he led a vote of no confidence against the government of Prime Minister Élisabeth Borne over proposals to raise the state pension age by executive decree.

[11] De Courson opposed the Socialist-led 2013 pension reform, instead co-signing an amendment providing for a gradual increase in the legal retirement age to 65.