The sun is middle aged and was formed about 4.5 billion years ago. It is expected to carry on just as it is right now for a few billion years.

The age of the Sun is estimated to be about 4.6 billion years old. It is said that the Sun will slowly start change, like a human does when they get older, when it reaches about 7 billion years old. You can find more information here: http://www.suntrek.org/sun-as-a-star/sun...