In the beginning children were more the target audience. Also in the 90s if you walked in a store like Sears, Target, Walmart and asked where the video games were they'd direct you to the toy department. If you looked at their holiday catalog and weekly sales ads you'd see them listed in the toy section.I need to stop you right there because this is terrible logic. Department stores and electronics stores sold consoles back in the day too. Unless video games were only sold at children's toy stores (they weren't) your point is moot.
Fred.
Much later down the line video games became far more mainstream and these stores moved them away from toys and to their electronic department.
The game industry changed to primarily target that 18-35 male demographic but Nintendo never really changed from the industries early days when there was clearly a focus on kids.
Maybe some of us are drastically different in age but back when I was a kid your console had to have a cartoon character mascot with some type of simple platforming game. You honestly think adults were the target of that type of stuff? Shooters existed back then but were nowhere near as common as they are now. Today every major end of year game is a AAA shooter first or third and the common game of those early days platformers is almost extinct.