Just remember the engine you dont have to worry about as they are 99% bullet proof and new ones are pennies as there is no demand! Just look at suspension, steering and everything else as 15 years and general everyday use reflected in the miles will have some effect on the car. Motorway miles are obviously great as the miles rack up but the other parts of the car get little wear.
Do all the checks as the fine people on here will tell you about and you should be fine.
