The age of the Sun is estimated to be about 4.6 billion years. This estimate is based on various scientific models and techniques, including the study of radioactive isotopes in meteorites and rocks, as well as the age of the oldest objects in the solar system. Scientists have determined that the Sun formed from a cloud of gas and dust known as the solar nebula, which collapsed under its own gravity approximately 4.6 billion years ago. This age is also consistent with the age of the oldest known rocks on Earth.