How old is the universe?

The age of the universe is estimated to be 13.8 billion years based on scientific observations and measurements. Scientists have utilized various methods such as studying the cosmic microwave background radiation, the rate of expansion of the universe, and the ages of the oldest known objects in the universe, among others, to arrive at this estimate. These measurements and observations provide evidence that the universe began with the Big Bang approximately 13.8 billion years ago, making it the currently accepted age of our universe.