Some possible sources of examples, many I haven't checked and many lacking precise details:
There are some mundane examples that fit your description but I don't think are what you are asking for. E.g., people working on buildings that take more than 10 years to complete, people buying something for a young daughter and saving it for when she gets married (I guess this used to be a thing), people getting mortgages, people saving for retirement, people studying anatomy when 16 in hopes of becoming a doctor, making a trust fund for your kid.
Miller predicted the return of Jesus in 21 years, not a century. (Added: I don't mean to imply that this makes him uninteresting.)
I would be very interested to learn if anyone has ever predicted the supernatural end of the world on that time scale.
I'm currently working on a research project for MIRI, and I would welcome feedback on my research as I proceed. In this post, I describe the project.
As a part of an effort to steel-man objections to MIRI's mission, MIRI Executive Director Luke Muehlhauser has asked me to develop the following objection:
In Luke's initial email to me, he wrote:
Luke and I brainstormed a list of potential historical examples of people predicting the future 10+ years out, and using the predictions to inform their actions. We came up with the following potential examples, which I've listed in chronological order by approximate year: