CAPTAIN KANGAROO is from a completely different time and from a completely different generation: back then, kids may have had more to do with their grandparents and such, but fast-forward to today, parents are getting steadily younger, due to poor upbringing and improper sex education, and as such, grandparents are getting steadily younger. In addition to that, notice something else too: other adults that kids would interact with are getting steadily younger too - teachers, instructors, coaches, etc. Kids today aren't very likely to interact with older people as much as they used to, and like others have been pointing out, today's kids are more likely to relate and respond to younger humans like Chris and Nina than they would the older humans.