ok i have a iguana 17 inches, me and my cousin measure it, and im trying figure out her age cause i got her as a baby and she growning so i wondering what her age a guy sent me this chart i read it but i wanna make sure this her age.. http://www.anapsid.org/iguana/agesize.html
Keep in mind that, with any reptile, growth rates vary GREATLY depending on the what kind of care they were given as youngsters, including temperatures, food choices, UVB exposure, etc. Without knowing the year he hatched, there's no real way to tell your ig's age for sure other than being able to say whether he's an adult (large) or "probably" a hatchling/juvenile (still small).
Another good care site is http://greenigsociety.org/. They also have a forum, if you click the "Message Board" link on the left of the home page.