As of 2016, who is the oldest boxer in history to win a world title?

Bernard Humphrey Hopkins Jr. (born January 15, 1965) is an American professional boxer who has held multiple world titles at middleweight and light heavyweight. He reigned as middleweight champion from 1994 to 2005, successfully compiling a record 20 title defenses during that period. He won the IBF middleweight title in 1994 and later unified the division when he added the WBA (Super), WBC, Ring magazine, and lineal titles in 2001. He also became the first male boxer to simultaneously hold world titles by all four major boxing sanctioning bodies when he won the WBO title in 2004.

After losing his title to Jermain Taylor in 2005 and failing to regain it in a rematch the same year, Hopkins moved up to light heavyweight and won the IBO and Ring titles from Antonio Tarver at 42 years of age, making two defenses of the Ring title before losing it to Joe Calzaghe in 2008. Three years later, Hopkins defeated Jean Pascal for the WBC and lineal light heavyweight titles, as well as regaining the Ring title. This made Hopkins the oldest boxer in history to win a world title, at the age of 46, breaking George Foreman's record set in 1994. Hopkins later broke his own record by winning the IBF light heavyweight title from Tavoris Cloud in 2013 and again in 2014 when he won the WBA (Super) title from Beibut Shumenov, at age 48 and 49 respectively.