The Sun is currently in the main sequence stage of its life cycle, where it is primarily fusing hydrogen into helium in its core. Based on current models of stellar evolution, the Sun is predicted to exhaust its core hydrogen supply in about 5 billion years from now.

After the core hydrogen supply is depleted, the core of the Sun will contract and heat up, causing the outer envelope to expand and cool, which will lead to the Sun becoming a red giant. During this phase, the Sun will begin fusing helium into heavier elements, and the core will eventually become hot and dense enough to begin fusing heavier elements like carbon and oxygen.

However, the process of fusing elements to produce iron is not a viable energy source for a star, as it requires more energy than it produces. Therefore, the Sun will not fuse elements to produce iron, and will eventually run out of fuel and become a white dwarf.
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