How many years did the Aztec Empire last, from the founding of the Triple Alliance in 1428 to the fall of Tenochtitlan in 1521?

Answer

93 years

The mighty Aztec Empire lasted less than a single century — Oxford University had already been teaching for over 300 years when the Triple Alliance was founded. Its capital, Tenochtitlan, was nonetheless bigger than most European cities of the day.

Source: Encyclopaedia Britannica