To downvote on this is shortsighted. Some sort of karma rot (or whatever you want to call it) it will be necessary if SO wants to stay relevant. GP's comment implies that almost.
I understand that this might come across as envious, but it isn't on my part, and I don't see how else to deal with the problem.
What a radical left idea! Distribute the wealth!
People shouldn’t be farming karma forever just because they gave some answer years ago.
If someone finds an answer which helps them and so upvotes it, why should the reward depend on the age of the question?
I think you misunderstand the workings of true karma.