Changes

==Time Frame==

==Time Frame==

Puberty usually starts in girls between the ages of 10 and 14 and between 12 and 16 for boys. The process takes different lengths of time for different people based on genetic factors and societal factors such as food supply and nutrition. The average age of the beginning of puberty has decreased measurably over time.[http://www.medicinenet.com/puberty/article.htm]

Puberty usually starts in girls at ages 10-11 and in boys at ages 11-12. The process takes different lengths of time for different people based on genetic factors and societal factors such as food supply and nutrition. The average age of the beginning of puberty has decreased measurably over time, particularly in females.[http://www.medicinenet.com/puberty/article.htm]

== See Also ==

== See Also ==

*[[Hormones]]

*[[Hormones]]

[[Category:Health]][[Category:Human Development]]

[[Category:Health]][[Category:Human Development]]