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Puberty is when a child's body begins to develop and change as they become an adult. Girls develop breasts and start their periods. Boys develop a deeper voice and facial hair will start to appear. The average age for girls to begin puberty is 11, while for boys the average age is 12.
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Answer:
It protects the health of humans and the environment.
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Throughout life our brains undergo more changes than any other part of the body. These can be broadly divided into five stages, each profoundly affecting our abilities and behaviour.
Gestation.....Part 1 of our special feature looks at how a good prenatal environment is needed to make the best out of the growing brain. 
Childhood.....Part 2: Life experiences in these early years help shape our emotional well-being, but neglect or harsh parenting may change the brain for good.
Adolesence......Part 3: Teenagers are selfish, reckless, irrational and irritable, but given the cacophony of construction going on inside the adolescent brain.
Adulthood.......Part 4: The peak of your brain’s powers comes at around age 22 and lasts for just half a decade – but there is an upside to the ageing brain.
Old Age......Part 5: Not everyone ages in the same way, but what’s the difference between a jolly, intelligent oldie and a forgetful, grumpy one? And can we improve our chances of becoming the former?
 
        
             
        
        
        
In the USA is is the law.  Medical issues are private matters between a healthcare provider and patient.  If a person's private information was to "get out"  it might affect their ability to get a job or they might face other predjudices  Also the private insurance numbers could be used to steal someone's identity.