Nearly 3 dozen? 32 still alive the last time I looked, minus at least 3 = 29.
In this article it mentions:
Shula, a Hall of Famer, is 83 now and uses a walker and motorized scooter because of back problems. He and Howard Schnellenberger are the only coaches still living; eight players have died and 31 are expected to attend the ceremony today. LINK
At most they expected 33 bodies there. That IS close to three dozen? I guess that depends on what your definition of "IS" is.