As someone who had a gameboy growing up, and now a child, I had to quickly do some math to console myself that I'm not yet "Grandfather" age. This is simply a (now) old man who had fun toys as a (normal age) adult.
I've been thinking about that ever since, marking various dates in my life where I could take this theoretical kid out for a beer, etc. If my child's child had made a similar… um… life decision… I could be a great-grandfather in two years.