Germany's prolific Miroslav Klose, the all-time World Cup top-scorer, announced his retirement on today at the age of 38.Germany's leading scorer with 71 goals in 137 internationals was without a club after his Lazio contract expired last season and he will now join the national side's coaching team.Klose hit a record 16th goal in World Cup finals during the 7-1 semi-final thrashing of hosts Brazil two years ago,which saw him overtake former Brazil star Ronaldo. Germany went on to win the title.He scored 121 goals in 307 matches in Germany's top flight and managed 68 goals in 173 Serie A games during fiveyears with Lazio, who he joined in 2011. Klose now plans to join Germany's coaching staff after an invitation from head coach Joachim Loew. According to a German FA (DFB) statement.