[solardev]

It's an interesting question academically, but who is going to fund the research for that? I wonder about the crossover between rehab therapists vs gamers. Maybe it's worth a literature review to see if people have tried?

As for your 60 year old friend, probably the more difficult thing is just convincing them to give it a serious try. They've avoided it for 60 years for a reason, presumably, and at that age they are unlikely to change much... people get set in their ways and their neuroplasticity decreases long before then.