When was the solar system was born?

Answer 1

Our solar system is believed to have begun forming shortly after the sun "went nuclear" (lit up by it's own power) which was about 4.5 billion years ago.

Answer 2

The solar system is believed to have formed about 4.6 billion years ago from a giant molecular cloud in space. This process of formation occurred through the gravitational collapse of a region within the cloud, leading to the creation of the sun and the surrounding planets, moons, and other celestial bodies.