Indiana Jones and the Kingdom of the Crystal Skull - Why Did He Die?
At one point in the movie Indiana points out that his father has died. How can this be when both he and Indiana drank from the holy grail in the last crusade which holds eternal life to those who drink from it?
If you watch the end of the last crusade, the knight says that you can only live forever as long as you stay in the temple. That is why the knight stayed in the temple for hundreds of years.