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I agree with Renormalised's view. Our sun is a second generation star, ie. has gone through a supernova explosion and re-formed, which makes it a fairly old star (much greater than 5 billion years, which is the age of the erath). The higher atomic number elements above iron (Fe) were formed in that explosion (normal fusion reactions in stars can only produce elements up to Fe, but supernovae produce much higher pressures to fuse elements together to give heavier elements). The Sag stars appear to be younger stars if they are all of similar composition and no elements above about He. If they are of similar size to our sun then they must be younger as they haven't burnt all their Hydrogen/helium yet.
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