If well cared for by a mechanically inclined owner and the Haynes book, pretty much.
I wasn't as kind as I needed to be to the transmission, treating it like a closed system when it isn't. Also, in my stupider youth, I burned out enough clutches to make my family a bit skittish with me near a stick, which is why I have an auto while the rest of my family's Subies are sticks.
That said, it's still possible for them to fail in catastrophic ways. At 195,000 miles, the water pump seized, and the symptom of its immanent failure was misdiagnosed. On Outbacks, it's driven by the back side of the timing belt, and when it seized, it got the belt so hot it melted the bearing cover of one of the idler pulleys. The bearings fell out, slacking the belt, and yet it still kept the crank and cams timed well enough to just walk off and melt a hole right through the front of the timing belt housing cover. The engine didn't quit until it came completely off a pulley and halfway out of the entire housing. The belt replacement was fine, but the replacement pulleys and and housing cover were a bit of a pain in the wallet. Also, unbelievably thankfully, the engine was designed to make it impossible for a piston to hit a fully open valve.