Aww. I'm pretty sure that making that insinuation is about as bad as someone actually making the claim.
Do you mean when did it form? About the same time as the earth.
Well, dear, first there wasn't very much - just energy in a very small space. Then there was a massive and sudden expansion. We're not sure why, but one hypothesis is the collision of two hyperdimensional membranes. Some time after expansion (and with a few intervening steps) there was nucleogenesis, in which the first protons condensed out of the pure energy. A while later hydrogen and formed by pulling electrons into the protons. (I don't know how the electrons formed, by the way)
A long while later, quantum fluctuations in the original mass were much bigger, and some areas were more dense than others. These areas collapsed under gravity to become galaxies, and denser areas within them formed stars when the gravitational attraction was so great it forced hydrogen atoms to stick together to form helium. Helium was then forced together to form other elements including carbon, oxygen, silicon and iron.
When the heaviest stars were spent, the force generated by fusing these things together was unable to prevent gravity from squashing everything together. For a heavy star, this either means that everything becomes really tiny and a black hole, or that it gets so hot again it explodes in a supernova.
A nova's high temperatures generate heavier elements still - all the elements in the entire natural universe - and then fling them all over the place.
The process of star formation though is continuous. Somewhere in one galaxy, there was an area of matter dense enough to collect together into a dense rotating disk. It contained the elements from some of these supernova, and plenty of the oxygen, silicon, carbon and metals which make rocks. There was also, like many places in the universe, a lot of water. A bit over 4.5 billion years ago, this disk of rock and gas was squidging together into individual planetoids and a central star. After a bit of squabbling, things began to settle down and we have the solar system, roughly as we see it today. This happened roughly 10 billion years after that first expansion.
Hey, no problem.