Targeting the right demographic depends on how functional a particular blockchain project is to them. It's true that millenials are the driving force behind most projects and most projects were also designed for them,  still adoption won't be adoption if every age demographic does not find some applicability of blockchain. I recently read about a project - HiNounou,  they're primarily designed for seniors.  They provide opportunities for wellness,  healthy living,  insurance and so many others.  I think they are one project pushing blockchain towards an age demographic that has more or less been abandoned by recent developers.