I like to listen to techno music. It is electronic dance music.
I have never heard about this, but it sounds  fun
It started underground in Detroit, Michican in the mid 1980s.
That's very interesting, I bet it started in the most interesting place
Techno was a meld of Chicago house, funk, electro and electric jazz.
What instruments are needed for it?
Usually just turntables and electronic MIDI equipment. 
amazing, can a 40 year old like me be a attention in a techno conceert?
There is no age limit to enjoy techno. It usually has a futuristic theme that feels like an electronic wave coming over you.