PSR B1620-26c

PSR B1620-26c or PSR B1620-26b (the issue of naming is covered in PSR B1620-26) is an extrasolar planet orbiting the pulsar PSR B1620-26 in the Messier 4, about 12,400 light-years away in the constellation of Scorpius. The planet is the oldest known extrasolar planet. It is believed to be about 12.7 billion years old.