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The question of the oldest thing in the universe is a difficult one to answer definitively. The universe is estimated to be approximately 13.8 billion years old, so any object or entity that predates this age is beyond our current understanding.

However, scientists have discovered some of the oldest known objects within the universe. One such example is the cosmic microwave background radiation (CMB), which is considered to be one of the oldest known phenomena. The CMB is electromagnetic radiation left over from the early stages of the universe, shortly after the Big Bang. It is often referred to as the "afterglow" of the Big Bang and provides valuable insights into the early universe's conditions and development.

Another candidate for the oldest objects in the universe are ancient star clusters and galaxies. For instance, globular clusters, which are dense collections of stars, are among the oldest known objects in our Milky Way galaxy. Some globular clusters are estimated to be over 10 billion years old, making them almost as old as the universe itself.

It's important to note that our understanding of the universe is continually evolving as new discoveries are made. Therefore, while these objects are currently considered among the oldest known, it's possible that future observations and findings may reveal even older entities or phenomena.