The zoo reported that Saturn knew his keepers, loved being massaged with a brush - and was able to crack steel feeding tongs and bits of concrete with his teeth if irritated.
Mississippi alligators usually live to 30-50 years in the wild, it added.
Saturn may even have been the world's oldest alligator - it's impossible to say. Another male alligator, Muja who is at Belgrade Zoo in Serbia, is also in his 80s and still alive.
But it's doubtful any alligator could compete with Saturn if it came to selling their memoirs.
The most headline grabbing detail is the rumour that Saturn had belonged in Hitler's personal collection, which is untrue.
"Almost immediately after the arrival of the animal, the myth appeared that it was supposedly in Hitler's collection, and not in the Berlin zoo," Interfax news agency reports.
It is unclear how the rumour started.
Moscow Zoo dismissed such reports, noting that animals "do not belong to politics and mustn't be held responsible for human sins".