I am always skeptical of studies that make "teenager" a combined demographic with regards to their expected responsibility (as opposed to likes/dislikes, etc).

I am always skeptical of studies that make "teenager" a combined demographic with regards to their expected responsibility (as opposed to likes/dislikes, etc). Being 19 is worlds apart from being 15. At 15 I still lived at home, worked on some farm for ~nothing and my dad provided me with everything a parent should. This is pretty much what was expected at the time. (It was a while ago so a cell phone was not even really an option). But at 19 I had already moved out and was 100% supporting myself. This is also pretty much what is expected, at least by parents. :) So to lump them into the same group in a situation like this strikes me as odd.