I originally came up with around 1994, using "a generation" as those who were alive in 1914 and spanning the "70 or 80 years". That failed, and then I had calculated, using "alive in 1914" and the human lifespan limit of 120 years, and barring a miracle where just one was kept alive from 1913 or 1914 forever, that 2034 had to be the upper limit.
Then they pull the rubbish that "a generation" is the group of people sharing the same characteristics in late 1995. Using that definition, as those traits are passed down generations, I was now looking at infinity. And, if I was doing something that was supposed to be extraordinary, it had better be for a limited time. Infinity didn't cut it--especially with being expected to just meet men at a$$emblies (which was the real reason I left).