The radioactive element carbon-14 has a half-life of 5750 years. The percentage of carbon-14 in the remains of organic matter can be used to determine the age of that matter. While digging near Maryland, archaeologists found charcoal that had lost 8.1% of its carbon-14. The age of this charcoal indicates that this is the oldest dwelling ever discovered in Maryland. What was the age of the charcoal?