Somebody earlier said "think about it... and don't just reply arrogantly" or words to that effect. Its not arrogant to state the simple truth and say that I cannot believe people still have difficulty grasping this remarkably easy concept from a not-too-intellectual film. They're not immortal. They crossed the seal. I'll go on for hours typing this same tripe if it makes me less arrogant but I don't see what I'm doing wrong??
And to answer other comments, immortality doesn't equal invulnerability. Not being all high and mighty here, I just read my Asterix the Gaul when I was a kid! In there it stated that drinking the magic potion made them invincible not invulnerable - I.e. they'd still die if the hapless romans stabbed them a gazillion times. Lesson for those still struggling to understand the intellectual ramifications of Last Crusade, the chain mail was needed to stop the knight being hacked to death. If he manages to abstain from such a fate - aided no doubt by residing in a cave in the middle of the desert for 800 years - then he'll keep plodding on for ever, provided he takes a sip of that sweet sweet grail juice every so often (apparently in the book).
Someone else said Indy didnt personally cross the seal????? Perplexed by this one. Surely you noticed him outside with his dad and buddies riding off into the sunset an' all?? Means he crossed the seal... personally.
So yes, internal maladies may well have been cured but he's not immortal. Just not poorly.
Is this clear enough?? Have I thought about this enough before stating exactly what I stated before?? If you consider this tone arrogant then tough, your own ignorance is a bigger issue for you I assure you!?