I'm around Bob's age (actually almost a year older), and I can confirm he had text and adventure games as a kid on PC. In fact, they were the dominant games back them, before the FPS revolution.
There were also other awesome games outside of the family-friendly Sierra games, like Commander Keen, JAzz Jackrabbit, Populous, SimCity, Prince of PErsia, The ORegon Trail, Archon, Wizardry, Lode Runner, Flight Simulator, the Ultima series, Civilization, Command & Conquer, the Cosmo series, the Dizzy series, Dune 2, Duke Nukem (pre FPS platformer), anything from SSI, Lemmings, Goblins, the Microprose library, the HORDE of NFL simulators (madden used to have great competition), fucking Rayman, Starlord, Warcraft, Worms, etc...
Seriously, Bob lives in a fucking closet under a boulder, behind a mountain.