The gray box credited with saving the video game market first went on sale October 18, 1985.
http://www.nintendoworldreport.com/news/24285
On October 18, 1985, the Nintendo Entertainment System first became available in North America. Available only at select retailers in New York City, the NES cost $160. The Control Deck (the unit itself) initially came with two controllers, the Zapper light gun, and the Robotic Operating Buddy (R.O.B.). To go with the latter two accessories, two games were included, Duck Hunt and Gyromite.
The NES would not get a full North American release until the following year. Nintendo of America would produce the NES for the next ten years, before finally ceasing production of the system in 1995.
So... the original Japanese release of the Famicom in 1983 doesn't count towards the system's age? ???