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We present preliminary though statistically significant evidence that showsthat multiplanetary systems that exhibit a 2/1 period commensurability are ingeneral younger than multiplanetary systems without commensurabilities, or evensystems with other commensurabilities. An immediate possible conclusion is thatthe 2/1 mean-motion resonance in planetary systems, tends to be disrupted aftertypically a few Gyrs.

On the Ages of Planetary Systems with Mean Motion Resonances