"I won't have lived long enough" implies you will be missing out on the tail end of HN, "I haven't lived long enough" implies you have missed the start (head end?) of HN (as I understand it).
"I won't have lived long enough" implies you will be missing out on the tail end of HN, "I haven't lived long enough" implies you have missed the start (head end?) of HN (as I understand it).
The tail end of HN hearkens to the good old days of the Sun as it aimlessly courses the void in a pod metaphorical to itself. He'll be fine.