I am 29 years old, certainly not a teenager anymore, but I am also without doubt not old. That we even have to ask ourselves this question goes to show there's something really fucked up about our world, probably because we are losing respect for the elderly.
I love technology and I think it's the answer to most of our problems, but its perseverance also scares me. That teenagers embrace it more than I do, that's only because teenagers are by definition raw and stupid, lacking the experience to foresee long-term problems ahead.
When I was in highschool I used to spend hours playing games such as Starcraft, Age of Empires, Quake 2 and Counter Strike. I was doing that instead of going out to play soccer or to have barbecues with friends. I was logging frequently to local IRC channels, instead of going to the beach. Now I regret waisting my time in highschool.
It's also easy for me to see how intense Facebook usage is actually removing friends from my life. That's because I don't have the curiosity necessary to see how friends are doing, since I find out from their Facebook stream, so one big incentive for asking them out simply disappears. And it is great that with Facebook I got connected to many primary school colleagues, but once past the thrill of seeing how they look like, I simply don't care anymore, as those people are actually strangers to me.
You're definitely over-thinking it ... as we grow older, we start realizing that the important things in life are the same as ever: sex, good food, family, friends, building stuff, earning money, living comfortably, going out, relaxing on a beach somewhere with a tequila, etc... anything that distracts us from doing those and we start seeing it as dangerous to our mental health.
E.g. I love my smartphone, I love how I receive my emails on it, but at night when I'm home with my son or on weekends when I'm taking walks in the park, I turn it off with no regrets.