Soundwave on 05 November 2021
There's nothing wrong with marketing to 20-year-olds. They are your lead demographic and buy more games than probably just about any other group.
Nintendo's actual fanbase is more this today:
Than this
But this isn't just a marketing thing. It's continual successive generations of Nintendo fans (NES - SNES - N64 - GCN - Wii - Wii U) era progressively getting older but still maintaining their fandom for the product for one. It's also general societal change, today it's just fine to still like the same things you did when you were younger and large scale shifts in pop culture in general ... see also: success of comic book movies.
