Relative to other "hard" sciences, cosmology and astrophysics are actually incredibly speculative endeavors. Note that Air & Space Magazine is currently running an article on the "Dark Flow" and "Cold Spot" observed in the most recent attempts to observe the CMB, and the very existence of these claimed anisotropies casts doubt upon the entire big bang theory.
So, just realize that while we continue to talk about the inferred timeline for these stars, that that very timeline is itself still something which is being contested. After all, if we are observing large-scale anisotropies in the CMB -- as appears to now be the case -- then that calls into question whether or not the CMB is indeed originating from the edge of space. The simplest explanation for large-scale anisotropies is that the microwave emissions are in fact locally generated.
We'd be wise to use far more cautious language than has become customary within science reporting today. After all, radio astronomer Gerrit Verschuur has claimed to have observed many dozens of correlations between the WMAP hotspots (which are supposed to originate at the "edge" of the universe) and local hydrogen emissions associated with kinks in interstellar filaments of (HI) hydrogen.
In response to these claims, the WMAP team ran some automated algorithms which they claim failed to show Verschuur's correlations. But, for those who actually read Verschuur's papers and books, he is very clear that he could never have come to his results with automated algorithms. There is a very simple reason for this: These frequencies are important to us largely because they pass through dust grains. So, what we see is numerous signals on top of one another, all originating at different locations in the universe. In order to sort these different signals out, a human must be involved in the processing. It takes Verschuur many thousands of hours of hand-processing to come up with his correlations.
So, when the WMAP team runs an algorithm and tells the world that there is nothing to see here, people should realize that this is a bit like shaking one of those 8-balls until you get the answer you expected.