Altenberg (pps) At the 43rd Luge World Championships of the International Luge Federation (FIL) in Altenberg, the new “U23 World Champions” in the women’s and men’s singles as well as the doubles will be crowned. Last year, Natalie Geisenberger, Felix Loch (both of Germany) and Ludwig Rieder-Patrick Rastner of Italy went down in the history books of the International Luge Federation as the very first “U23 World Champions”.