The milage of this car is 100,000 but it is all highway miles and it has been regularry serviced and everything.

Is this too many miles for a first car, and the price is 7,000. Is this a good fit for my sons first car? HELP!

Personally I think you are setting the bar fairly high to be giving your son a Mercedes Benz for his first car.

Money isn't the issue, but I think something more practical like a Camry or an Accord will keep his expectations reasonable. If you start him out with an MB where does he go from their? How do you trade up and what does he move into when it comes time to get him his move up car.