Dating myself by answering this. :-)
The first computer that I programmed on was an Atari 800XL when I was a teen. I learned BASIC on it and wrote the first program I got paid for at age 16. It was a star field simulation that was used as a background for a cable television program credits screen (something like below).

Programming was lots of fun but very challenging back then (minimal memory). Very different from today. :-)