The only reason they have appeared to have aged well is because they filled in a lot of the silliness and nonsense with quality content from other sources such as clone wars (which ended up being good) and comics, etc. to fill in the gaps.
It also helps them age a lot when you compare them to the latest trilogy, which I'm sure I don't even need to elaborate why that is.
For the record I still occasionally watch the prequels now, but when they came out, they were very poorly received and for good reason.