I was probably 5 or so.
This was during the time when i heard that dial up modem sound from my dad's "computer room" every night when i went to bed.

The computer had a huge CRT monitor which made that annoying high pitch noise but i loved playing with it so much i didn't mind.

My dad installed a Croatian knock off version of Super Mario from a floppy disk he got from a magazine (i still have it lol).
Every time you died you'd have to start the game again by typing "mario" in CMD. Me and my sister played it so much we became pros.
He also tried explaining how he codes in Turbo C but i guess i was too young to understand it.