I’m a Japanese young engineer and same generation. I've encountered a similar situation. There were many colleagues of the company who don't know copy and paste and so on. It seemed Kanji problem in comments, but young people can type Kanji exactly, on rather, they don't know how to use computer like double click, where is power button etc. Also, Japanese IT companies hire new employees don't have CS degrees. They hire people in all of major. It may be a problem with hiring method.