But we don’t. Moreover, any species should be able to colonize the whole galaxy with our today’s technology in a few million years. But we’re here, so they never colonized this part of our galaxy. The oldest part of our galaxy is 11 billion years, our solar system is over 4 billion years, meaning we exist only for a third of the galactic lifespan. More than enough time for an alien civilization to evolve and colonize the whole local galactic cluster.
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We are on the outer edge of the galaxy. And given the sheer magnitude, an entire solar system going through a star cycle in 7 billion years is not impossible. So there could have been life 3 billion years ago, but they didn’t bother with our system because it was still too young and unformed, and in the time since they just moved on.