Judaism does not teach young earth creationism. It is 5780 (Jewish calendar) years since a soul was put into the body of man and thus created a human being. Before that there was a physical being without a soul which did not qualify as man, but as just another animal however intelligent it was. The Torah does not necessitate that the earth was created in 7 24 hour periods, after all the 24 hour periods could only be measured after the creation of the sun and moon. In his book “Genesis and the Big Bang” the physicist Gerald Schroeder reconciles Genesis with the time periods of the Big Bang theory based on relative frames of reference.
While true, the two theories are not necessarily correlated.
The Theory of the Big Bang is not science. It is religion. It is a theory about a past unobserved event. It is not falsifiable. It remains a circular argument, and has arguments extending from it, the very definition of a religion.
The Theory of Creation (which states that life arrived on Earth as a result of the act of an intelligence) is not science. It is religion. Same reasons.
The Theory of the Continuum (which states that the Universe has no beginning or end, it always has been here and always will be) is also a religion.
The Theory of Abiogenesis (which states that life originated on Earth through a series of random unspecified events) is also a religion.
The Theory of Evolution (which states that present day life evolved from more primitive life) is also a religion. Same reasons.
The Theory of Natural Selection (which Darwin created) WAS a theory of science (it was falsifiable). It has been falsified via logical extension and via examples of animals that have characteristics that do not help the animal in any way. It is no longer a theory of science.
We do not know when the Big Bang happened, or even IF it happened. We don't have a time machine to go back in time to see what actually happened. We do not know whether any god, gods, or aliens brought life to Earth or whether life originated here somehow. We cannot go back in time to see what actually happened. A theory of science MUST be falsifiable. Theories that are NOT falsifiable are not theories of science.
Translations between languages is always problematic. The Hebrew 'day' is a period of any length, not necessarily the 24 hour day that it's commonly translated into in English, German, Spanish, French, Chinese, Japanese, or a whole host of other languages. The words translate, but idioms do not.
So the practical upshot is that we simply don't know. There is no way Gerald Schroeder could possibly know. At least he probably made some money selling his book.