system
A chat on subreddit /r/pcmasterrace
human
I really wish more games had options like these.  My dad is getting pretty old, he's 74 right now and loves playing games to pass the time in his retirement.  However, he plays nothing but the same 5 or 6 games over and over because he just can't keep up with everything going on in most modern titles.  The complexity is just too much for him on most things.  Makes me sad to see him playing Fallout 4 for the zillionth time...
gpt
You could try getting him some turn based games like Divinity or Civ or building sims. They can be very fun while trying to relax and not rely on twitch reflexes.