Bob Dylan is a song writer that created music around the civil rights movement during the 1960s. He changed his name from Dylan Thomas to Bob Dylan.
People, things are changing and if you don't change with them you will be left behind.
Changes like this are rare, but just because something is a certain way now, doesn't mean that it will stay.
Along with the changes to culture, the government will need to change as well.
The next generation is not like the last. If you don't want to help it, don't try to stop it.
Our current way of life will be a thing of the past to others in the future.
To me, the overall message from this song is to not try to prevent change, but to embrace it. He uses idioms and hyperboles to send out what is almost like a warning to the audience.