Take any test.  If a multiple choice test answer includes the words "always" or "never",...it's probably a wrong answer,...move on.
Perhaps what might be said is that "many" or "a large percentage" of teenagers, statistically speaking, have a sense of invulnerability.  That may be closer to the truth. 
Personally, as a teenager, I cannot say I had some sense of "vulnerability", I never gave it a thought.  Perhaps this is a more accurate interpretation,...the general lack of forethought before engaging in "risky behaviors".  The life lessons behind so-called vulnerability and consequences were always in retrospect,...someone got hurt emotionally or physically,...or worse,...killed.  Then you learned something,...albeit the hard way.   
That said,...and this has not changed,...so-called "risky behavior" was always about my ability to control it.  For example, I love to drive fast,...but I don't like being a passenger in a car that is going fast.  I love the biggest, fastest roller coasters,...but I am not going to parachute out of a plane.  I do not swim well, so I do not like being in boats, or white water rafting,...but I don't have a problem with SCUBA gear and exploring a reef.