Jehovah’s Witnesses have long believed that 1914 is the year Jesus began ruling in heaven. They also believe the people who were alive and baptized and witnessed the events of that year represent an “anointed” generation.
You may be aware of a belief among Christians that Jesus will return soon. Some of them say it’ll happen at some undetermined time in the future… but since 1975, the JW Watchtower Society has interpreted Matthew 24:34 to mean that Jesus will come back at some point during the lives of that “anointed” generation.
Maybe you can see the problem with this. There aren’t many people (much less JWs) left who were alive in 1914 and old enough to understand events like the outbreak of World War I. So what do you do if you’re a religious leader?
You reinterpret everything… even if your current interpretation is already stretched very thin.