All these young people talking about being old! I paid a secretary through the nose to type my thesis in 1964, doing much of it myself, and using carbon paper to get a copy. Lots of handwritten graphs of spectral sequences. The memory of that horrid process may be one reason I never published my thesis. It is roughly 150 pages of dense calculations.
At Chicago in the 1960's and 1970's we had a technical typist who got to the point that he, knowing no mathematics, could and did catch mathematical mistakes just from the look of things. He also considered himself an artist, and it was a real battle to get things the way you and not he wanted them.
My collaborators and I published five long Springer Lecture Notes in Mathematics volumes between 1972 and 1986, and all are cluttered with hand written symbols, although the Selectric decreased the number in the last of them. The first of them (in which I introduced operads) is especially painful reading now.
Somebody on this thread mentioned translations by non-mathematicians. I could never find it again, but I once read a paper about CW complexes that was translated from a Chinese original. It talked about the $n$th bag of bones.