20 years.
The Game Boy was released in North America on April 21st, 1989. Missed it by a few days, but meh. :P
My Game Boy still works. I think it's locked away somewhere, though. I used to always play this thing. It was awesome. I beat Pokemon Red on this thing.
Those were the days. ^_^
Already a thread about this in Legacy...
And it's not a third party platform.