Gollum
Gollum is a fictional character from J. R. R. Tolkien's legendarium. He was introduced in the 1937 fantasy novel "The Hobbit", and became an important character in its sequel, "The Lord of the Rings". Gollum was a Stoor Hobbit of the River-folk, who lived near the Gladden Fields. Originally known as Sméagol, he was corrupted by the One Ring and later named Gollum after his habit of making "a horrible swallowing noise in his throat".
Ra's al Ghul
"Batman: Birth of the Demon" provides a rough figure of 500 years for Ra's al Ghul's age. Due to living so long, he is assumed to have lost track of how old he is. "Azrael" #6 (July 1995; written by Dennis O'Neil) places Ra's age closer to 450 years. As he tells Jean Paul Valley, "I appear to be a vigorous fifty. I am actually a very vigorous four hundred and forty-eight...or is it four hundred and fifty-three? I lost count during the Black Plague. No matter". In "Batman Annual" #25 (published in 2006), Ra's al Ghul is described as a "700-Year Old International Terrorist".