Both of these make perfect sense, I think. You really don't get these paradigm-shifting inventions very often. I'm talking about things like the printing press, cotton gin, iron founding. That guy born in 1900 got to see a revolution in transportation in the early 1900s, and then in mass communication in the mid-1900's (TV). The telephone and electric lamp go in there in their respective spots too. Then we've got the computer chip which has caused such a paradigm shift that we're now out of the industrial age, into the information age.
No matter when you're born you get to see some cool stuff invented, but it seems like there are only a few REALLY big ones in any given century.
Right, of which pretty much anyone under 20, maybe even 25, hasn't seen, so maybe it is a lack of that. Then again, it might be something else.
RayB: generally my experience was not like that, nor did I see it - however, I don't think it's the same anyways. Except for the perhaps obvious 'stranger-danger' situations, if an older person talked to you, you talked back. They weren't a freakoid because of their age. And though we talked about them, as we did anyone, behind their backs it wasn't to do with their age* but usually some circumstance.
*the caveat here was when we saw someone disabled/immobile/physically incapable, but that I think is simply a matter of being so vital and seeing someone who is not, and not being familiar with it, rather maveling at it.
Anyways, I'm not expressing my own ideas or feelings on age, my own age, etc. in this thread. I'm just relaying what I've experienced. I don't think it's absolute, though I do think it's wide-spread. Something I think related: high school graduates in my year book look far more mature than some recent ones I've seen pictures of.