Whereas the USA can print their own money. Also France is the most taxed country in OCDE (French Wikipedia link sorry: https://fr.m.wikipedia.org/wiki/Prélèvements_obligatoires)
Mostly because in France pensions are financed through taxes and managed by the state. If you want to compare apple to apples, you would have to include spending on healthcare, education AND pensions here.
From your link: Ainsi plus de la moitié recette des prélèvements obligatoires est affecté au financement des retraites et de la sécurité sociale.