Mileage is just a number. Go by the condition of the car and make sure all the preventive maintenance is done on time.
Imagine two identical brand new cars bought by two executives living in Kottawa. One works in Galle and the other works in Colombo Fort. If both use the car to travel to work daily on weekdays for 2 years, the car travelling to Galle will have 100000 mostly expressway miles while the other car will have only 20000 miles. If both were maintained according to the schedule, used for its intended purpose and no major accidents, guess which one will have less wear and tear (other than the tires) and be in better overall condition.