New research suggests that Saturn's rings may be as old as the planet itself, around 4.5 billion years old, rather than the commonly believed 400 million years. Scientists propose that the rings appear pristine not because they are young, but because they are resistant to dirt. Computer modeling shows that micrometeoroids vaporize upon impact with the rings, leaving little residue and keeping them clean. The findings challenge the theory that Saturn's rings are relatively young and suggest they may have formed closer to the planet's earliest times.
Source: https://www.thestar.com/news/world/how-old-are-saturns-rings-study-suggests-they-could-be-as-old-as-the-planet/article_9a1637b2-849f-5ab8-9c03-78b881e5a0d1.html