...the French heroes of the American struggle now began to return to their own country, regaling their compatriots with stories brought back from the New World. These stories concerned a country where American rebels--with French assistance, of course--had taken charge of their own destiny and cast off the oppressive rule of a king, creating thereby a very different political system. The Marquis de Lafayette, for example, arrived back in Paris to his wife's family home of the Hôtel de Noailles on the 21st of January, 1782. This happened to be the day set apart for the official celebrations of the birth of the Dauphin, now three months old. There was the ceremony of Churching of the royal mother at the cathedral of Notre Dame, a right of purification after childbirth, followed by a banquet at the Hôtel de Ville and in the end, a huge display of fireworks. The queen, taking the Marquise de Lafayette--a member of her own household--into her coach, proceeded to the Hôtel de Noailles where she graciously received Lafayette himself at the door. It was the kind of considerate gesture at which Marie Antoinette excelled. It did not, however, stop Lafayette observing of a subsequent lavish court ball, that the cost would have equipped a whole regiment in America. He was literally and metaphorically coming from a different place.
Marie Antoinette: The Journey by Antonia Fraser, Chapter 13. Lafayette was fully saturated in American philosophy at this point. He was 24 when he returned to France a successful general of the American Revolution, ready to throw proverbial hands and make changes.