In discussing whether a new student, 45 year old (presumably man) could learn judo, the gist of the article was that if in reasonable physical condition then he could learn judo through Jû no Kata, perhaps other kata. Randori and shiai were for 20- and 30-year olds, it opines.
This would explain the number of judo instruction books I have from the 1920s and 1930s that start with long explanations of JNK, illustrated by a couple of middle-aged men, one balding, one mustachioed.
I wonder what Kanô shihan would think of today's shiai, with septuagenarians and even older competitors!
NBK