Early home gaming consoles like the Atari 2600, Atari 7200, Colecovision and original Nintendo Entertainment System (NES) read software from game cartridges — hard, boxy contraptions that contained a sort of internal motherboard with exposed metal connection points at the end that made a connection when they were inserted into the gaming device. When faced with an old gaming system, it takes even teenagers a moment to figure out how to insert the cartridges and power up the system. They also have trouble figuring out what to do when the game doesn't work right away, which often required removing and reinserting the cartridge, sometimes several times, to get the game going.
Although some handheld gaming systems use little cartridges, the last home cartridge console was the Nintendo 64, released in 1996. All others at that point had started to move to CD-like optical media. Having constantly connected high-speed Internet and growing up in the age of the mobile computing devices have also made downloading software second nature to kids, more so than fiddling with physical storage media.