How old was he?
How old was Joe Gideon, when he died?
shareAlthough Bob Fosse was about 52 when he made All That Jazz (and Joe Gideon is Bob Fosse), I think Joe was younger...like 43-45. Roy Scheider was about 45 at the time.
shareFor whatever it may be worth:
If you look at Fosse's age at the time of the events paralleled in the movie, that would have been 47. That's around the opening of the movie Lenny (clear parallel to the stand-up movie here) in late 1974 and the initial development of the original production of Chicago (which fits with dialog in All That Jazz about creating a show where his separated wife would play a significantly younger character) in early 1975.
Yes, Fosse had the near death experience which was depicted in the film in 1975,
at age 48. He tried to clean up his act, by the time he was filming "All That Jazz"
he was going back to his old habits. Joe Gideon's death in the film indicates Fosse's
awareness(acceptance?) that his lifestyle would one day kill him and it did in 1987.