How do we determine the age and elemental composition of a star?

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Routaran
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http://www.youtube.com/watch?v=6u1I5Gwti9s&feature=feedu

How exactly do we calculate the age of a star?
Is there any speculation as to how this star as existed in this state for so long without producing more heavy elements for so long?
 
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Ahh. Thank you. That clears things up for me on this.
 

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