"Sun encompasses an age to determine what proportion hydrogen it's converted over its life versus what proportion is left for the future".

Present age:- 4.6 billion years

At some 4.6 billion years old, the Sun is about halfway through its life. In another 5 billion years it'll be a traditional “adult” star no more. Here’s the thin on the upcoming demise of the star that you simply owe everything to light, warmth, energy, and life.

why does the sun age:

Using measurement, scientists have estimated the age of the oldest meteorites to be around 4.6 billion years old.

The solar system was formed. within the process of measurement, scientists make the most of the very fact that these radioactive elements decay. In other words, the radioactive atoms are unstable. So, the nuclei of the radioactive parent atoms decay, or breakdown, until they form stable, non-radioactive, daughter atoms. Uranium, as an example, decays into lead. Additionally, this decay occurs at a predictable rate. Scientists can thus take the ratio of uranium atoms to guide atoms and calculate the approximate age of that rock. If there are still plenty of uranium atoms left, we all know that the rock is comparatively young. If most of the uranium has already decayed into the lead, we all know that the rock is way older.

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Manomay Shravage
No I meant why does it age
Sangeetha Pulapaka
Because the Sun continues to 'burn' hydrogen into helium in its core, the core slowly collapses and heats up, causing the outer layers of the Sun to grow larger. So, as time passes the sun gets larger. This has been going on since soon after the Sun was formed 4.5 billion years ago. It is a very gradual process, and in the last 4 billion years, the Sun has barely grown by perhaps 20 percent at most. It will not grow by much more than another factor of a few for the next 6 billion years, but at that distant time, it will make a rapid transition to a red giant phase and its outer surface will expand by several hundred times to perhaps the orbit of Venus. So, we have to say that the sun like a human can age too, but ages much much much slower. Thank god for that!