Everyone.

For kids but I'm happy with that.

Their target audience is definitely kids but people of all ages can enjoy Nintendo's offerings.

unless they don't like the gameplay in those particular titles

Mostly Adult imo.

also.....

Critics who treat 'adult' as a term of approval, instead of as a
merely descriptive term, cannot be adult themselves. To be concerned
about being grown up, to admire the grown up because it is grown up, to
blush at the suspicion of being childish; these things are the marks of
childhood and adolescence. And in childhood and adolescence they are, in
moderation, healthy symptoms. Young things ought to want to grow. But
to carry on into middle life or even into early manhood this concern
about being adult is a mark of really arrested development. When I was
ten, I read fairy tales in secret and would have been ashamed if I had
been found doing so. Now that I am fifty I read them openly. When I
became a man I put away childish things, including the fear of
childishness and the desire to be very grown up.”

C.S. Lewis

Nintendo games are clearly geared towards children.

Nintendo is for both. Who said an adult game had to have violence in it?

Well they make games for kids but adults play it

Not an excuse!

I was about to say the exact same thing.