They were born in the early 50s, long before computers and consoles were anything like mainstream. They watched us game as kids, but it wasn't until very recently that either of them has actually tried playing much. They're both responding to games like teenagers, but that's anecdotes, not data.
I'd love to know if it's an issue of age alone, age+responsibilities (i.e., do 30- to 40-year-olds who don't have kids or other time-consuming responsibilities shift their preferences the same way equivalent-aged parents do?), or age of their gaming career (i.e., do people who pick up gaming in their middle years or later start with the same interests as young gamers and gradually age out of them with time, or do they start with the interests of "old" gamers?).