SF Kosmo
Al Jazeera Special Reporter
This isn't about discontinuation, it's about the lack of a next gen successor.Game Boy was released April 21, 1989 in Japan. It got discontinued in March 31, 2003.
That's 14 years. Over 5,000 days (vs 2,687 of the Switch).
That said, game boy color didn't come out until late 1998, so that's over 9 years.
And it's also debatable to what extent you would even consider it a next gen successor vs a stop gap refresh. On paper it's closer to like a New Nintendo 3DS, but in practice it had a lot of exclusives and stood on its own.