Right after the first movie..
There's still the expanded universe to look into. The cartoons like Clone Wars and Rebels are very good, there's lots of novels by different writers, as well as comics and video games like Knights of the Old Republic.
There's a lot of lore in the series that isn't on the big screen. It's an open series like that, and it inspires a creative universe to be built upon it, and there's lots of gems in the EU. Go over to Starwars.wikia.com, and there's lot of things to read. That or TV Tropes.
I stopped watching when the Ewoks were introduced.
Not for my son and his family.
People are still madly in love with them... though I've never been huge into them.