Long Island light heavyweight Joe Smith Jr. will fight 51-year-old Bernard Hopkins on Dec. 17.

Hopkins (55-7-2, 32 KOs) made the announcement for his final fight on Monday at the Forum in Inglewood, California.

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Hopkins, who turns 52 in January, last fought in November 2014, losing his two light heavyweight title belts to Sergey Kovalev in a lopsided decision. The Philadelphia native famously made a record 20 defenses of his middleweight titles over a 10-year stretch before moving up in weight and winning more titles deep into his 40s.

Smith, who is from Mastic and works as a laborer for General Building Laborers Local No. 66, is coming off a stunning technical knockout at 2:32 of the first round of Andrzej Fonfara in June that gave him the WBC international light heavyweight belt.

“I’m very excited about fighting on HBO,” Smith said in a statement released by HBO. “I know now all my hard work and dedication has paid off. I am looking forward to retiring a boxing legend.”

Smith, who turned 27 in September, is 21-1 with 18 KOs.

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With AP