he put the end before 2034.
that would only be a 42 year overlap from Fr. Franz, and less for those older partakers, that could have survived Franz, as mentioned by D. Splane, who would have been alive past 1992.
2075 is a more realistic upper figure.
Joseph age chronologies are notoriously vague, rounded up, convoluted. open to challenge, I would put my winning bet on the modern day, franz-like types.