It is not possible to determine the age of single star. It is done by comparing with other stars in the same galaxy. Stages in life of star are Gas cloud, Proto-star, Stable star, Red gaint, Planetary Nebula and Remnant. Sun is 4.5 billion years old, and will last for another 4 billion years in the present form of star.
Sun is 150 million km away from earth, and is as bright as 4 trillion trillion 100 watt light bulbs. Sun is full of gas and rotates in 26 to 30 days depends on the position of gases. Sun is 20 times hotter than earth.
Sources:
Solar Facts
How old is sun now?
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