It runs in the family. My Dad is a huge nerd gamer. Right now I'm sat in his living room watching him play Elder Scrolls Online: Tamriel Unlimited on PS4.
From about age five or six he started letting me play his video games instead of just watching. The first title I played on PS1 was Spyro the Dragon. I kept stealing his Gameboy to play Metroid II: Return of Samus, The Legend of Zelda: Link's Awakening, Taz-Mania, and later when he let me reset his Pok?mon Yellow he never got that game or his console back until he eventually bought me a GBC for Christmas haha. The first games that were completely my own were Gameboy Gallery and Mickey's Wild Adventure (PS1).
This is basically what I came here to say. It's just always been a part of my life. Though they didn't make me wait until I was 5 or 6, I was playing at like 2 or 3. As they like to say,
"You didn't even have hair on your head yet and you were telling us we were playing it wrong." :')
My parents (and sisters, for that matter) were geeks/gamers, to some extent, before I was even born. My mom less-so than my dad; she played arcade games when they first became a 'cool thing', but he's been playing D&D long before she started playing Galaga at bowling alleys.

Even after that, she really only played Tetris and Dr. Mario, the original LoZ was too hard for her.
what a casual
Ahem, lol. Needless to say - 23 years ago, I was born into a household with an Intellivision, Atari 2600, NES, SNES, and 3 of the original brick Gameboys (my 3 sisters', and then eventually 'mine').
As I got older they added the Gameboy Color, N64, Gamecube, PS2, and finally a 360 to that collection.
After that I had to start buying them myself.
I never stood a chance at having a social life.