Some consultants and investors make me grumpy. In my line of work I speak with junior members of giant consulting firms and newly minted researchers within the back offices of VCs. When I talk to these young folk, I cringe in the face of ignorance about aging, never mind about the markets they are studying. Recently one of these investors opined this gem: "I like to invest in areas where there is demonstrated demand." Let’s mull that over, I thought. But don’t you own a number of technologies that a few years ago had zero customer demand?” Well, yes, that’s true, he admitted and we silently contemplated tablets and smart phones, portable GPS devices, and iPods, where consumers gravitated toward an invention they never knew they needed. Did anyone actually demand telepresence, location-based restaurant meet-ups, Skype video conferences, smart bandages or interactive TV? For that matter, in the 1980’s did anyone conceive of an assisted living industry, telehealth nurses, or self-checkout in a store?