So that must be why theyhateseatbelts.

 

Is there a difference between taking more to get hurt because you're magical and having accidental magic prevent you from getting hurt?

 

Yeah, because when you drain your magical core you would no longer be protected by accidental magic.

 

I don't think magic makes you physically tougher. There's more likely a combination of 2 things are work: 1) your magic will act on its own to preserve your life, to at least some extent; and 2) if you get hurt, chances are a healer can fix it, it'd take a lot of really severe harm to get to the point that a healer couldn't get you better. Those two things together will definitely extend you average life span.

 

Yeah, wizarding medicine is a huge advantage. From what we've seen, as long as you're still alive when you get to a healer, you'll make a full recovery within 24 hours. And I expect most of the major causes of natural death are also fixed pretty easily: a good healer could vanish cancer cells, or fix up heart disease with a single spell.

 

Not necessarily. Hermione needed more than 24 hours to recover after the battle at the ministry. Also if dark magic is used the damage can't be healed. According to Molly Weasley in book 7.

 

That second choice isn't compatible with canon. We've seen number of examples of accidental magic, and all of them happen during great distress. That implies that children have to be aware of coming danger for their magic to react. If that were the case, Quidditch would be much more lethal sport, because Bludgers could seriously injure people if caught unaware, as Quentin Taurentino has put it.

I am still not convinced of higher durability of wizards, though.

edit:

Yeah, and we've also seen 70 kg Bludgers made of iron flying probably around 100 km/h being blasted away with a bat by small children. That doesn't mean all wizards are multiple times stronger than muggles. It simply means Bludgers are bewitched not to seriously injure (with one exception, where Dobby has re-bewitched it).

Also, about that Neville falling off a broom thing... I've also heard of people dying by slipping, or tripping. That doesn't mean these people were more fragile than others; they were just unlucky. It could've been luck.

 

Fair enough on Hermione, I didn't do a full canon-check beforehand. Though considering how badly she was hurt, recovering at all is pretty impressive.

 

Considering Malfoy was able to get fucking Dumbledore fired from the school because students were being petrified, I fail to see how you could imagine "lack of regard" a thing.