My dad's always been That Techy Asian Guy so... xD
Well I was using youtube when I was 6... which was almost a decade ago, so... well I've been around for awhile

Besides I needed the interwebz for fap material at an early stage in life like Tomoya

I didn't REALLY start using the internet until around 5th grade though, started off with runescape and then my internet knowledge just grew exponentially from there.
I think first time I found myself at 4chan was at 11 (oh god the horrors), and stuff like forums started at 12 ish, starting uploading crap to youtube around that age too (hey my old account get's a few hundred thousand views)
Now... now the internet is my life x.x forums, email, youtube, niconico, facebook, communication, homework, education, music, everything is on the web now x.x even books ffs