I can't recall them being stubborn, maybe I don't want to remember :D. Some of them we used to drop the whole crossmember with the engine and gearbox onto the ground. Some engines are just tight on the locating dowels, 4wd drives that get driven in salt water can be a fight to get off.
I'd say over a 20 year period of working in non-dealship workshops, Ford 6cylinder wins hands down for blowing head gaskets, followed by the 3 series BMW then maybe Subaru. I've got 2 x EJ25's non turboed and turboed 13 years old and I haven't the touched the motors other than servicing.
The 6 cylinder engines are usually pretty good, there's always suspicion around those cylinder head failures because how do you know the quality of the head studs or the cylinder heads were even done up correctly in the first the place.
If it's been looked after you shouldn't have many issues, I would service the cooling system and use genuine coolant, 9 times out of 10 it's dipshits cooking them that causes the problems. I worked in a shop that done mechanical work for an engine machinist, and I'd only seen a couple of cars...
Most people in their youth are pretty active, no motorised transport, plenty of time to play social sports but all that changes when you're older. I used to do 50~100 push-ups without even thinking when I was a teen, I'd be in trouble if I could do more than 20 these days.
The thing that scares me with high speed impacts is that your head swings like a pendulum and hits hard.
Life works in reverse sometimes, they tell you to exercise and stretch when you're young and healthy at school, but you should be doing it more often when you're older.