Chiss are physically adults roughly at 10 standard Coruscant planetary sun rotations of that in humans (10 years of a ~385 days per year).

Chiss are adult mature longer than humans though our lifespans are similar to that to humans.

Humans take nearly 16-18 years to reach adulthood in puberty and until 25-26 years of age for neurological maturity. 

Humans are adult mature shorter than many other species given their life experiences.

From CsillanRose a good Chiss resource

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