That's not heavy mileage, that's a little below average in the US per year. Your car is 5 model years old, so that's 11,400 miles per year: the average is 12K miles per year in the US. You're just getting it broken in!
But, you're wondering what high-mileage cars are running into, and it seems you may have caused some confusion from the title.
The tricky thing with judging what your car will do compared to those with high mileage is the usage pattern is notably different, and how things wear will be notably different, even if the maintenance is done perfectly. To get yours to the same as a high-mileage car made at the same time, your car will be notably older before it has the same mileage. Age itself is a major factor, and causes things to fail from degradation, such as dry rot. You may not have your hoses, etc. last as many miles as a high-mileage car, as an example. Another thing to consider is how long oil goes between changes, not just in miles, but in time: with the horizontal cylinders, the head gasket has the same oil on it longer if you go 6K miles at a regular rate, versus a high-mileage car. The car with lower mileage may have the oil be more acidic/corrosive for longer, so your engine may need a new head gasket sooner in terms of miles.
All this says is: the safest comparison is your car to a car with the similar conditions (including climate/weather) and maintenance over time, but unfortunately, you may not get cars ahead of yours that are identical to compare against for lifespans, as the parts/designs change enough to make it hard to impossible to accurately compare.
