List of Famous people who are 51

Vincent Rijmen is a Belgian cryptographer and one of the two designers of the Rijndael, the Advanced Encryption Standard. Rijmen is also the co-designer of the WHIRLPOOL cryptographic hash function, and the block ciphers Anubis, KHAZAD, Square, NOEKEON and SHARK.

Oliver Kaczmarek is a German politician of the Social Democratic Party (SPD) who has been serving as a member of the Bundestag from the state of North Rhine-Westphalia since 2009.

Jonathan Ward is a retired American actor. He has starred mostly in television series and television films, but has also appeared in a small number of feature films, including the critically maligned 1988 cult film, Mac and Me. His acting debut was on Broadway as Michael in Peter Pan.

Michael Helber is a German badminton player. He competed at the Summer Olympics in 1996 and 2000. Helber was the bronze medalist at the 1989 European Junior Championships in the mixed doubles event partnered with Kerstin Weinborner. Played for the Fortuna Regensburg, he had won five consecutive men's doubles title at the German National Championships partnered with Michael Keck in 1995 and 1996; and with Björn Siegemund in 1997, 1998 and 1999.