How old is the Universe estimated to be?

The universe is estimated to be approximately 13.8 billion years old based on a combination of observational evidence from various sources, including measurements of the cosmic microwave background radiation and the expansion of the universe. By studying the rate of expansion through Hubble's Law and the age of the oldest star clusters, scientists have been able to pinpoint the age of the universe with remarkable accuracy. The figure of 13.8 billion years is widely accepted in the scientific community and reflects our best understanding of the time elapsed since the Big Bang, which marks the beginning of the universe as we know it. This estimation aligns closely with the findings from NASA's Planck mission, which provided detailed measurements of the cosmic microwave background, supporting the conclusion drawn from other astrophysical observations.