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While reading Stanislaw Lem's essays on advanced civilizations, I had a question: When did the earliest generation of population 1 star systems form? How much older could they reasonably be than our star system?

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Lem may be an SF writer, but that doesn't make non-fiction essays by him on-topic for an SF site. Your question looks to me like it would be on-topic on Physics. –  Gilles Sep 1 '13 at 21:04
    
So, do you want the oldest Pop I systems we have observed or the age and characteristics that we know of from our theories? –  Cheeku Sep 1 '13 at 23:58
    
@Cheeku - I was looking for the theoretical starting point, and I'd like to learn what we have observed –  SteveED Sep 2 '13 at 2:28
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up vote 3 down vote accepted

The oldest Population I stars are about 10 billion years old. Those stars have 0.1 times the metal abundance of the Sun (source).

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at what point do these stars get to about 75% the metalicity of the Sun? –  SteveED Sep 3 '13 at 4:17
    
@SteveED That could form a whole separate question. It's the kind of thing that could be well answered by running stellar evolution codes. –  Chris White Sep 10 '13 at 16:11
    
@ChrisWhite - thank you very much! –  SteveED Sep 11 '13 at 0:53
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