The Boston Symphony Orchestra is extending the contract of its music director, who last year became the orchestra's youngest conductor in a century.

The orchestra announced Monday that 36-year-old Andris Nelsons' new eight-year contract will run through 2022. It replaces the original five-year deal that began in September.

The new contract also includes an evergreen clause that reflects what the orchestra said was a "mutual desire" for a commitment beyond 2022.

The Latvia-born Nelsons previously served as music director of the Latvian National Opera and the Birmingham Symphony Orchestra in England.

He says in a statement that he's honored and excited to extend his future in Boston.

Managing Director Mark Volpe calls Nelsons' first year as music director of the 134-year-old orchestra "wonderfully successful."