There are some implications in canon that wizards are more durable than Muggles, although canon isn't completely consistent on this matter. It may be simply due to the unconscious or reflexive use of magic. The two data points that are most relevant in canon off the top of my head are Hagrid's remark in book one that there's no way Lilly and James would have died in a car crash, and the fact that the upper limit on the lifespan of wizards is apparently much higher than that of Muggles (Dumbeldore is well over a hundred.)