>Are the attitudes of young people and old people towards North Korea different?
Very much so. The war happened at 1950. Older Koreans were affected by the war directly or indirectly. There are so many people still alive who have been through the Korean War. My grandparents were born in North Korea and escaped to South in their teens.The kids of this generation grew up listening to their parents' horrible war stories and why their dad is mentally unstable or uncle doesn't have legs. Of course not all, but a lot of older people generally fear and hate North and communism, understandably. It's like how Americans thought of USSR during the cold war era. I feel sad for older Koreans because in a way they are destined to still live in the past. To have PTSD level of fear about communism. Some of them believe we should occupy North and reunify as South Korea.
On the other hand, the younger Koreans generally younger than 50, have no reason to care about North in the first place. It's not like we can go to North or meet many North people or anything. It just doesn't exist to younger Koreans. These people generally think Anti-communism is an old agenda and simply don't care. The only exception is men in their early 20s who have to perform about two years of compulsory military service. North Korea is the main enemy of South Korea, and the biggest reason the military service is mandatory here. So these men get "brainwashed" to think of the enemy as evil. I think more than a small number of these men believe this after the military service, but even then it's just some ideas they think to themselves. It's still not.. important. North Korea doesn't affect South in any way so it's like who cares what you think about North. Hope that made sense.
About reunification,I think it more depends on person. Generally younger people less want reunification.
I don't think it will happen in my lifetime and I don't think it should. It's not that I don't want, but it needs more steps to be prepared for that. I think North has to become a successful and independent country by itself first and then we can have partnership.
Although I think there's chances the border will be opened and we get to have relations and access to each other in some ways soon. I wouldn't have thought this was possible a year ago, but I see hope with Trump, maybe. Even though it doesn't look as promising as it did months ago. Trump was really the first president ever who cared about Asian politics for whatever reason. Weather we like it or not, for now he's the only option we can rely on.