How old is the oldest known planet?

Even before planet Earth and our Sun were born, there came first a planet that has outlived a million stars and saw through the whole process of creation and destruction of heavenly bodies. What is it?

The oldest known planet, so far, is speculated to have formed right after the Big Bang. So, how old is it? According to NASA, it is about 13 billion years old, having 2.5 times the mass of Jupiter. Keep in mind that, so far, the estimated age of our universe is about 13.7 billion years old.

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