About 1,000,000,000,000,000,000,000,000,000,000,00 years ago.
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Pluto has been classified as a dwarf planet in the Solar System since 2006. This reclassification was made by the International Astronomical Union (IAU).
Meteor impacts were most frequent during the Late Heavy Bombardment period around 4 billion years ago, when the solar system was still forming and many small bodies were orbiting the sun. Since then, the frequency of meteor impacts has decreased significantly.
You're in the solar system right now.You've been in the solar system since the moment you were born,and you'll be in it for the rest of your life.You can never journey to the solar system, because you're in it now,and there's no way you'll ever be out of it.
The planets in our Solar System have existed pretty much as long as the Solar System - about 4.6 billion years. Planets in other, older, solar systems may have existed quite a bit longer - almost as long as the Universe (which is 13.8 billion years old).
Meteorites have generally been around since the formation of the Solar System, over 4 billion years ago, until they happen to collide with Earth.