@msolga,
Some of the stuff makes me think it's not just triple J listeners, but.... there is a possibility that Triple J is no longer youth radio. How many Beatles tracks? The Stones, Dylan? None of them made the original all time hottest 100. Something happened.
You're right about the 1990s, but that kind of makes sense depending on the approach of voters. If they were going for 'classics' that stand the test of time, then clearly anything released in the last five years just hasn't had a chance to pass that test.
It's the old stuff that interests me - I can't figure out if the jays listening audience is my age and older, or gen Y is deeply influenced by parental tastes. It amazes me how many young dudes 'love' the Eagles, for example. And that AC/DC are still popular.
I guess everyone's got their own musical journey - and understandably I prefer mine.