I think I was in 4th or 5th grade when I asked my Dad "How long does it take to write a video game?" I'd dreamed up an action side scrolling version of Breakout/Arkanoid and wanted to play it outside of my head.
30 years later, my first game, Curl, is in the iOS and Google Play stores! It's a fun 3D platform jumper with custom physics. I'm working on version 2 (with an improved achievement system, better instructions, and sound) now.
The side scrolling Breakout is still only in my head.