Shortly, within our twentieth century, the "battle in the day of Jehovah" will begin against the modern antitype of Jerusalem, Christendom." The Nations Shall Know That I Am Jehovah p. 216
"Some of that "generation" could survive until the end of the century. But there are many indications that "the end" is much closer than that!" Watchtower 1984 Mar 1 pp.18-19
"He was laying a foundation for a work that would be completed in our 20th century". Watchtower 1989 Jan 1 p.12.