In which of these sports did Bernard Hopkins become the oldest person to win a world title?

Bernard Humphrey Hopkins Jr. (born January 15, 1965) is an American former professional boxer who competed from 1988 to 2016. He is one of the most successful boxers of the past three decades, having held multiple world championships in two weight classes, including the undisputed middleweight title from 2004 to 2005, and the lineal light heavyweight title from 2011 to 2012.

After losing the undisputed title to Jermain Taylor in 2005 and failing to regain it in a rematch the same year, Hopkins achieved further success in 2006 when he moved up to light heavyweight, winning the IBO and Ring titles from Antonio Tarver at 42 years of age. Two defenses of the Ring title were made before a loss 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 championship, 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 ages 48 and 49, respectively.

Nicknamed "The Executioner", and later "The Alien", Hopkins was known among observers for his longevity and ability to continue competing successfully at an advanced age. Widely considered one of the greatest boxers of the modern era, he was a highly strategic and defensive boxer.