Touring South America

A tourist is traveling with a guide through one of the thickest jungles in South America, when he comes across an ancient Mayan temple. The tourist is entranced by the temple, and asks the guide for details. To this, the guide states that archaeologists are carrying out excavations, and still finding great treasures. The tourist then queries how old the temple is.
"This temple is 1503 years old", replies the guide.
Impressed at this accurate dating, he inquires as to how he gave this precise figure.
"Easy", replies the guide, "the archaeologists said the temple was 1500 years old, and that was three years ago"