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"Nobody's making games for the retired people" – The growing yet underserved market for grey gamers
(www.gamesindustry.biz)
This is a most excellent place for technology news and articles.
Why would older people prefer hidden object games?
Because they're always forgetting where they left shit, its good practice for them.
My guess is that they're not twitchy and they keep your mind active.
There are so many non-twitchy games, though, and hidden object games are not what they grew up with.
And maybe they like twitchy games. Platformers were among the first games older people played in their youth.