Maybe a peek at some of the old timers. Most of these guys took time off steroids and probably on average did not use as heavily as today's pros.
Arnold:
heart valve surgery in 40s. Currently 68 and healthy as far as known
Franco: no known problems currently alive 75 years old
Dave Draper:
heart surgery in 50s. Alive and healthy
Rick Drasin: alive and healthy 71 years old.
Some cardiac hypertrophy
Ken Waller: Alive and healthy as far as known. 74 year old.
Seymour Koenig: Born in 1934 seems to be still healthy as of 2009
Albert Beckles: Alive and healthy 85 years old.
Tom Platz: 60 years old apparently healthy. Had some health issues at end of career.