This, and so much this. "The hope of the world is in our generation". No, it really isn't. Any given generation is, statistically, a lot like every other generation (certainly over spans of 4-6 generations).
hope based on (a) there are always some number of people at a given point in time working toward the goals you want to be hopeful about (b) there's always some non-zero chance that they may be successful.
but hope somehow contigent or predicated on the age of those people? nah.