Both of them drank from the Holy Grail, which gives you everlasting life. Henry Jones was about to die if it weren't for drinking from the Holy Grail and healing his wounds. So technically, shouldn't he have died as soon as he set foot outside the Temple?
The Knight said you can't leave the Temple. But he wasn't too clear if that meant to be immortal you also had to stay in the temple, or that you merely weren't allowed to take the Grail out of there.
The Grail Knight explains it perfectly to Indy, after he wisely chooses the correct Grail:
"The Grail cannot pass beyond the Great Seal. That is the boundary, and the price of immortality."
I take that to mean that while people wishing to be healed can come to that temple and drink from the Grail itself (whether or not the Final Challenge of traps was reset or not) they cannot take it with them or the whole place will collapse, as we started to see when Elsa selfishly took it and walked across the Great Seal. It's a good limitation imposed by God on what would otherwise be coveted by everyone, but since you'd have to keep drinking from the Grail to achieve immortality, as the Knight did as an example, you'd be stuck in that place forever and couldn't leave. More limitations.
It seems the only people God wants being immortal is devout Christian worshippers, like the Knight. In other words, people who don't mind an extremely limited lifestyle.
The Grail Knight explains it perfectly to Indy, after he wisely chooses the correct Grail:
"The Grail cannot pass beyond the Great Seal. That is the boundary, and the price of immortality."
It's a good limitation imposed by God on what would otherwise be coveted by everyone, but since you'd have to keep drinking from the Grail to achieve immortality, as the Knight did as an example, ...
It's weird that the Grail heals his wounds but does not turn him young. Aging is a wound, it just happens over a longer period of time.
The Grail was not allowed to go past the seal, the people went back and forth over it and nothing happened. Apparently The Grail must be used periodically to keep someone from dying even if it does not stop them from aging.
The grail heals but doesn't de-age. That's why the knight looks as old as he does (as did his brother who made it out of the desert after 150 years and still died of "extreme old age")
... three Knights of the First Crusade. Three brothers, to be exact ... Two of these brothers walked out of the desert one hundred and fifty years after having found the Grail and began the long journey back to France.
But only one of them made it. And before dying of extreme old age, he supposedly imparted his tale to a -- to a Franciscan friar, I think.
He is immortal. Thats why he survived the nuclear blast in the fridge
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