Q: What would happen if the speed of light were only sixty miles per hour?
A: As we approach the speed of light, the aging process slows down. So, if the speed of light were sixty miles per hour, we would have even more people speeding, especially older people trying to stay young. As a matter of fact, physics would demand that we go faster than the speed of light. The safest thing is to drive at a steady sixty to keep time and the highway patrol off our necks. Airplanes would become obsolete in this slow light world, because you would be going so fast, relatively speaking, that you'd be back before you even left. This would make business trips unnecessary and lead to economic collapse.
So, to answer your question, life, if the speed of light were sixty miles per hour, would be youthful, fast, and dark.
why dark?