1. Technology invented before you were born which you don't think of in technology. Like sewers and paper.
2. Technology invented between the ages of 0 and 35 which you get super excited about. For many, this is the Internet, mobile phones, etc.
3. Then there's the technology developed after you're 35 which you see as pointless and which makes you angry.
Mark Stevenson gave his thoughts on the third category: "For my generation that's things like 3D tv and Twitter; I've got friends who are literally furious that Twitter even exists." Mark further said: "The people who determine the strategic direction of a nation or an organisation are usually in the last category. Yet most of the population are in the second category and so you get institutional bewilderment."