https://screenrant.com/indiana-jones-immortal-theory/
One interesting theory believes that Indiana Jones may have been granted magical powers by his encounter with the Holy Grail, but is he immortal?
No. The theory is wrong. As the knight clearly explained, the price of immortality was not crossing the seal in the temple. Indy and his father were both immortal because they drank from the cup of Christ, but their immortality only lasted until they left the temple.
No since he left the temple and was beyond the seal.
Plus they are killing him off in the next one and replacing him with a female.
Those reports were clearly false! Just a bunch of incel trolls…. Wait, is that why it was massively delayed and they did all those reshoots and why it has a crap ending?!
In the end, they didn’t replace him with an insufferable distaff version, they just used her to shit all over him and make him into a loser. The funny thing is they think what they did with that distaff character was in any way likable. They’re so obsessed with strong women they can’t even write strong women.
No. But his health was "reset" when he drank from the grail
This may explain why, in his nineties, he drives a monster truck and looks like he's in his 70s ("Young Indiana Jones" shows are supposedly canon)