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I think the term "high mileage" is born out of the very common practice of only keeping a car for 3 years and consequently so many secondhand cars on the forecourt having a typical 3 year mileage and then any higher mileage is considered as "high mileage". All a load of bollox IMO. Mind you, not all cars are built like German cars.
I must admit that as I approached my 100k mileage I did feel a bit that, not just me, but my car was also becoming an OAP, particularly as the two coincided. Now I think bring on the next 100,000!! She's going better than ever, but that might be helped by a few mods.