Nothing wrong with 'kid' styles for 'kids'...

By which I imagine that you mean almost anything from THIS century...

If ancient old musical styles are what you are shooting for (I pretty much cringe at ANY cha-cha style!) I think on the whole, Yamaha have nailed the senior citizen market.

Just don't blame Korg for making something that MIGHT appeal to players under the age of 40 (50+, to be honest!). Either they start buying arrangers, or the market segment dies, and arrangers go the way of the 'home organ'.