Mario Gigante (wiki), New York mobster and member of the Genovese crime family, dead at 98. Brother of the far more notable Vincent "The Chin" Gigante (wiki, 1928–2005).
To my knowledge, he was the oldest notable member of any of the U.S. crime families.
Only one of the Gigante brothers left alive – Louis Gigante (wiki), who was a Catholic priest and stayed out of organised crime but is alleged to have sexually abused young boys. I can't find an age for him anywhere.