Yes, the current scientific consensus is that the universe is approximately 13.8 billion years old, not 15 billion years old. This age estimate is based on extensive observational and theoretical evidence from various fields of science, including cosmology, astrophysics, and particle physics.
The age of the universe is determined through several lines of evidence, with the most prominent being the measurements of the cosmic microwave background (CMB) radiation. The CMB is the faint afterglow of the Big Bang, which provides a snapshot of the universe when it was about 380,000 years old.
By studying the properties of the CMB, such as its temperature fluctuations and polarization patterns, scientists can infer the age of the universe. Additionally, measurements of the rate of cosmic expansion using techniques like Hubble's law and the observations of distant supernovae have contributed to our understanding of the universe's age.
It's important to note that scientific knowledge is always subject to refinement and revision as new evidence emerges. However, based on the current understanding and consensus among scientists, the most widely accepted estimate for the age of the universe is approximately 13.8 billion years.