Scientists estimate the universe is about 13.8 billion years old.
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The age of the universe, determined through various methods such as the cosmic microwave background radiation and the expansion rate, is approximately 13.8 billion years. This estimate comes from observations and measurements made by the Hubble Space Telescope and other astronomical instruments. Understanding the age of the universe helps scientists study its evolution and the formation of galaxies, stars, and planets within it.
Source: nasa.gov