Because our solar system is only 40 million years old, it evolved intelligent life; the universe has at least 20 billion years old, and those older than our galaxy, certainly would have evolved more senior creatures.
Because our solar system is only over 4 billion years old, we have evolved intelligent creatures, and the universe is at least 20 billion years old, and in galaxies older than ours, more advanced organisms must have evolved long ago.
Because our solar system has only more than 4 billion years of history, and has evolved intelligent creatures; while the universe has at least 20 billion years of history, in those galaxies older than us, there must have evolved more advanced creatures.<br>