one century, 100 years?
possibilities:
1) the guy lived an extra ordinarily long life (living to 100 is nothing new but he started something 100 years ago. so he must be even older)
2) there is a mistake and he should have said half a century or something
3) technology allowed him to live longer (nano machines improve body or what ever, similar to nano machines in crysis 1 that helped in speed mode (see old crysis 1 trailers if you don't know about these))
4) i have bad ears