The Jazz Age was in the 1920s. Since then jazz has been considered a major form of expression via music.
Its not too old but the Jazz Age was in the 1920's. That's when it really started to be seen as a big form of musical expression.  I would start with some smooth Jazz to get used to it. Its easy listening.
Jazz doesn't make any sense to me.  Is there any order to it at all? It's known for its blue notes and its swing. It's also known for call and response vocals, its polyrhythms and for improvisation. I don't even know what blues music is, what is that? Blues started in the Deep South in the late 19th century. It was started by African Americans. Jazz just sounds like a lot of noise to me which makes me think it is some sort of modern statement or something.  Is it a newer style of music?
Since the 1920s Jazz Age, jazz has become recognized as a major form of musical expression.