And yet the audience reaction to that has been largely positive - both in aggregate and in the theater I was in - it's the critics that have been more sour compared to how they reacted to Crystal Skull (while the audience disliked that one much more).

If you wanna say "don't make a movie about an old version of that character," fine. But give it a fucking break with the idea that the filmmakers are attacking you by showing that an 80 year old version of the character wouldn't be the same as a 40 year old version.

Let's remember that the last successful film in the franchise made EXCELLENT use of aging and the effect of that on the character's relationships with a great premise and execution by Ford and Connery, too. We were already getting to peek beyond just "here's Indy again doing Indy things"