Developing physically into an adult takes 2 to 5 years. Most boys will be fully developed and stop growing taller by age 16 to 18 years. Onset of puberty and ethnicity.

The coaches Chael Sonnen Chael Sonnen will coach Team Sonnen on Season 33 of "The Ultimate Fighter." Photo by Chris Unger/Zuffa LLC. Record: 30-18-1 Age: 48 From: Clackamas County, Oregon Notable: ...