Boutrous92

Hi guys I am new to these forums and in general new to Audi. They seem like wonderful cars and all and I am trying to purchase a used one but kind worried. The Audi A6 2010 3.0T. The car has 185,000Km's which is roughly 115,000 Miles. I was wondering if I should be worried because it is considered high mileage. What issues will I come across with this car and will it last me about 5 to 6 years? The private dealership says they don't have the maintance history file but apparently all the parts look genuine. Price is $13,990+tax....