What is the secret of the long life of the Monaco peoples?

Monaco has an area of 2.020 km2 (0.780 sq mi), making it the second-smallest country in the world after the Vatican. Its population was about 38,400 based on the last census of 2016.With 19,009 inhabitants per km², it is the most densely-populated sovereign state in the world. Monaco has a land border of 5.47 km (3.40 mi), a coastline of 3.83 km (2.38 mi), and a width that varies between 1,700 and 349 m (5,577 and 1,145 ft). The highest point in the country is a narrow pathway named Chemin des Révoires on the slopes of Mont Agel, in the Les Révoires Ward, which is 161 metres (528 feet) above sea level.