This age is determined by various methods, including:

* Radiometric dating: Analyzing the decay of radioactive elements in meteorites, which are thought to have formed at the same time as the Sun and planets.

* Stellar evolution models: Studying the properties of stars, including their brightness, temperature, and composition, helps scientists understand how stars evolve and estimate their ages.

It's important to remember that this is an estimate, and the exact age of the Sun might vary slightly. However, 4.603 billion years is considered the most accurate age based on current scientific knowledge.