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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.
Serious answer? By making a game that targets a vulnerable group that preys on loneliness and declining mental capacity. This speaks less about "what games would old people play and enjoy" and more about "how to leverage abusive techniques to maximize the extraction of wealth".
Oof. I can respect your cynicism though.