What is the age of the universe, approximately in years?

The age of the universe is approximately 13.799 billion years, which is supported by extensive astronomical observations and measurements. This figure has been determined using various methods, including the study of the cosmic microwave background radiation and the observation of distant galaxies. The precise measurement reflects the time elapsed since the Big Bang, marking the beginning of the universe as we understand it.

The other figures provided, such as 10 billion, 12 billion, and 15 billion years, do not align with current scientific consensus. While research and estimates have evolved over time, the value of 13.799 billion years is recognized as the most accurate and accepted estimation based on the latest data from sources like the Planck satellite and other cosmic surveys. This highlights the importance of rigorous scientific inquiry and the role of technological advancements in improving our understanding of cosmic history.