Here's a breakdown:

* Current Age: The Sun is about 4.6 billion years old.

* Main Sequence Stage: The Sun is currently in its main sequence stage, where it fuses hydrogen into helium in its core. This is the longest stage of a star's life.

* Red Giant Stage: In about 5 billion years, the Sun will run out of hydrogen fuel in its core and start fusing helium. This will cause it to expand into a red giant, engulfing Mercury, Venus, and possibly Earth.

* White Dwarf Stage: After the red giant phase, the Sun will shed its outer layers and leave behind a dense, hot white dwarf star, which will gradually cool and fade over billions of years.

So, while the Sun has a long life ahead of it, it's not an infinite one. Eventually, it will reach the end of its life cycle and cease to exist in its current form.