SO if you are ancient like me , you will remember Mike Mentzer ...
also at the beginning of this clip is a chunk of video with Sergio Olivia and Jr. in diapers
So I think Jr holds the recorded for longest periods between appearing on the Mr O stage.
IIRC that was 85 and he was in diapers, and just appeared in the Mr O in December 2020
that is what 35 years ? he will easily hold that record for a very long time...
any how , here is a clip of Mike mentzer