Because it depicts teenagers, yeah. It would have been fairer if it showed a dozen people with a more representative spread of ages. It would still skew young though.

I am Gen X, a computer scientist and often use my phone while walking.

Have often jumped on the wrong train because of my lack of attention. Not life threatening but results in extending my one hour journey by 30 minutes. But that kind of error did also happen occasionally pre-phone so at least now I have entertainment for that extra half hour :)