I recently (well, during the Steam Summer Sale) bought Microsoft FSX. It's got a decent number of downloadable planes, though I'm not sure about the F-104.That's Strike Fighters 2: North Atlantic with the Europe map. It's getting a little long in the tooth and was always a "sim lite". These days I'm more into DCS World. I wish someone would make an F-104 for that one.
I wanted to be a fighter pilot when I was in my 20's and went as far as taking their tests and scoring high. Then the verdict was you can't have so much as one speeding ticket ever. I said well damn although my record was now clean I had 16 tickets then were off my record but the Air force didn't care.
I remember building the plastic model of the F-104 Starfighter when I was around 10 or 11. I thought it was the coolest jet fighter back then, maybe replacing the F-89D Scorpion, or F-101 Voodoo as what I would fly around in while saving the world.
In the kit's (Revell or Monogram - I can't recall) instruction sheet, there was a paragraph or two on the airplane that you were about to build. They listed it's speed at 1500 mph. That blew my young kid mind at that time - around 1960.