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Scientists believe that most of the planets coalesced at about the same time, 4.5 billion years ago.

However, though they all formed at roughly the same time, many scientists believe that the gas giants formed faster than the rocky planets, taking tens of millions of years rather than hundreds of million years to grow into planets. Also generally, the nearer the sun the faster the planet will tend to grow to full size. So, Jupiter was probably the first planet and therefore the oldest planet in the solar system, by a few million years ahead of Saturn, and Mercury is probably the oldest rocky planet in our solar system.

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Q: Can you list the planets according to age?
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