The 'Old Bolsheviks' was a nickname for the Soviets who had been leaders of the Bolsheviks prior to the October Revolution. The last one alive was Lazar Kaganovich, who died five months before the Soviet Union fell. He was, by that point, long out of power and might have been suffering from dementia. His family relates that he had mostly been interested in his family by that point.

His great political disappointment of the eighties was being denied access to Molotov's funeral, which was for personal reasons. They had been friends and two of the few doctrinaire Stalinists left. He griped about the state of the Soviet Union but mostly because of his reverence for Stalin, belief in Stalinism, and a general crotchetiness ('back in my day!').

From Iron Lazar and The Wolf of the Kremlin.

The question has come up before, and it's worth mentioning that there is at least one known participant in the 1917 October Revolution who was alive and interviewed in the 1990s for the BBC program People's Century, a poet named Alexander Briansky. He participated in the storming of the Winter Palace, and parts of his interview can be seen starting here.

Unfortunately, they don't ask him (at least in the footage used for the program) what his thoughts were on the fall of the USSR, but I would point out that the interview with appears to be in his house with a bust of Lenin behind him, and he is wearing a number of Soviet medals (including an Order of the Patriotic War for World War II service), so it seems reasonable to infer that he remained proud of that service. Note: I can't make out the medals on his left chest...one of them appears to be a Jubilee Medal for the 100th Anniversary of Lenin's Birth.