the age of the universe is estimated to be approximately 13.8 billion years. This value is based on measurements of the cosmic microwave background radiation, the expansion of the universe, and observations of distant celestial objects. These measurements provide strong evidence for the Big Bang theory, which suggests that the universe began expanding from a hot, dense state around 13.8 billion years ago. However, it's worth noting that scientific understanding and measurements related to the age of the universe continue to evolve as new data and research become available.