Age Limits for our Universe
“The universe cannot be younger than the objects contained inside of it. By determining the ages of the oldest stars, scientists are able to put a limit on the age. …” [The reference is listed below.]
The problem I see here is that the oldest objects in the universe might be located outside of the known universe, which means that we can establish the minimum age of the universe but not its upper limit.
“The uncertainty still creates a limit to the age of the universe; it must be at least 11 billion years old. It can be older
, but not younger. …”
Notice that it states that the universe can be older. I conclude that the universe might be much older than the age calculated for the known universe—the one we can observe with the most powerful telescopes we have been able to build so far.
“If the expansion rate is known, scientists can work
backwards to determine the universe's age, …”
I doubt that this rate is known.
"In 2012, WMAP estimated the age of the universe to be 13.772 billion years, with an uncertainty of 59 million years. In 2013, Planck measured the age of the universe at 13.82 billion years. Both of these fall within the lower limit of 11 billion years independently derived from the globular clusters, and both have smaller uncertainties than that number. …”
Ref.: http://www.space.com/24054-how-old-is-the-universe.html
Here I see another problem. Many scientists hypothesize that the rate of the expansion of the universe at the beginning was infinite.
“When the universe was smaller and more dense, it therefore follows that the expansion rate was much larger than it is today. Indeed, as we extrapolate the universe further back in time, we reach a point where the density, temperature, and expansion rate were all infinitely large. …
Ref.: http://preposterousuniverse.com/writings/cosmologyprimer/reallyearly.html
If the initial rate of expansion of the universe was much larger than the present rate, then our calculation of the age of the universe might be off by an unknown quantity. And if we can’t be sure how old is the known universe, our knowledge of the entire universe is even a greater mystery.