The key point in this question is identifying the term for the older generation that the younger voters are expected to replace. The correct answer is based on the information that mentions 'baby boomers and the Silent Generation' as the ones to be replaced. Option A is incorrect because it refers to a different generation. Option C is incorrect because it refers to the younger generation, not the one being replaced. Option D is incorrect because it refers to yet another generation, not the one mentioned in the given information.