Astronomers have calculated that the rings are less than a billion years old, mysteriously young compared to the 4.5 - billion - year age of the solar system. (discovermagazine.com)
At 4,567,300,000 years old, «they define the formation age of the solar system.» (discovermagazine.com)
All four giant planets, they claim, crowded closer together in their orbits in the early age of our solar system about 4.5 billion years ago. (slate.com)