It occurs to me that the Earth is about 4.5 billion years old and will be engulfed by the sun in another 4.5 billion years. Bacteria have been around since almost the beginning. The oldest fossilized bacteria being from around 3.8 billion years ago. I do not know whether bacteria will continue to survive right up until the sun goes nova. So, we’re roughly at the mid point for life on this planet.
So what? (Please keep reading. I’m coming around to a very important point in my long-winded way.)