Mighty morphin' Centaur rings — a distant icy object's rings are transforming

Interesting paper reference provided, https://iopscience.iop.org/article/10.3847/PSJ/ad0632

"1. Introduction The Centaur (2060) Chiron was discovered in 1977 (Gehrels et al. 1977; Kowal 1979). Its orbital semimajor axis ranges from approximately 8.5 to 19 au, with an eccentricity of 0.38 and an inclination of 7°."

Just how long has this centaur been in orbit? Other past reports I read indicate many are short lived in their current positions relative to the 4.56 Gyr solar system age model.
 

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