kirby is for kids. its made extra easy so they can get into gaming without frustration.
but the kirby games are so nice that every adult with a child in his heart can enjoy em.

Your thread is awful in that you are asking us to pick one of two answers, neither of which is actually correct. Nintendo products are accessible, largely, to the broad spectrum.

Uh.. both?

u know Haribo? ist for both ;)

No option for grannies?

none of the above...

where's the "all ages" selection....?

They lean more towards kids, but their core fanbase is actually mostly adults.

It's kind of one of their issues, kids are more into tablets and/or "Calladooty" by the time they reach age 10.

But yeah kids are still the primary part of it. I had to babysit like 8 kids for an hour last week (don't ask, lol) and one of them still rocks the 3DS and was telling me about how he has no less than three "Marios" for it. 

obviously not for kids who want to play "mature" games only

Kids obviously.
Adults don't have the time to buy and play games.

I think the peak gaming audience is the 17-22 year old male though honestly. 

They have the time to play games, but also the disposable income to buy their own games (rather than kids who have to rely on mom/dad to get them). 

When I was 10, I got maybe 2-3 games a year if I was lucky, it all boiled down the birthday and Christmas gifts, but when I was 18, I would buy 5-8 games a year no problem. 

This is why for home consoles in a way, Sony's approach is better.