Puberty lasts 2 to 5 years for both boys and girls. Boys tend to start puberty around a year later than girls. This means that boys may be shorter than girls of a similar age for 1 to 2 years.

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: ...