so does Nintendo.com, Zelda.com, Gamerevolution, all the other reviewers and the manual of course.. lemme give you the legend as in the intro and in the manual:
"Long ago there existed a kingdom where a golden power lay hidden. One day, a man of great evil found this power and took it for himself, and with it at his command, he spread darkness across the kingdom. But then... just as all hope had died, a young boy clothed in green appeared as if from nowhere. Wielding a blade that repelled evil, he sealed the dark one away and gave the land light. This buy, who traveled through time to save the land, was known as the Hero of Time. The boy's tale was passed down through generation until it became legend (<-- note that part.)
And then a day came when a fell wind began to blow across the kingdom, and the great evil once again crept forth from the depths of the earth. The people believed that the Hero of Time would again come to save them. But the hero did not appear...
What became of that kingdom...? None remain who know. The memory of the kingdom vanished, but its legend survived on the wind's breath (<--- note that part)
On a certain island, it became customary to garb young boys in green when they come of age. Clothed in the green of fields, they aspire to find heroic blades and cast evil down. The elders wish only for the youths to know courage like the hero of the legend...
game begins...
yes, it's not literally said that it's exactly 100 years after OOT.. but you can get the point pretty well from reading the intro