Given the lack of specific data points such as selling prices, offers accepted, and listed prices of similar cars, I will use the new car price and apply depreciation logic. Assuming a new 2023 GAC GN8 2.0L GP costs around 150,000 AED, and considering a depreciation rate of 10% per year, the car would depreciate by 15,000 AED in the first year. Since the car is one year old, the estimated price would be 150,000 AED - 15,000 AED = 135,000 AED. Additionally, considering the car's average condition and mileage of 57,591 km, I will further reduce the price by approximately 10,000 AED to account for these factors, resulting in an estimated price of 125,000 AED.