The first official black hole was discovered in 1972 and named Cygnus X-1. However, because black holes are created when stars collapse upon themselves, black holes have been around for almost as long as stars have been around, possibly longer. That would mean black holes have been around for a couple billion years.
The universe is estimated to be 13.75 billions years old (uncertainty is 110 million years). The most distant black holes that we have seen were around 700-800 million years after the Big Bang — 13 billion years ago. The Big Bang itself was not a black hole, by definition — they haven’t been around literally “forever,” at least in our conventional views of the progress of time.
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