Short of the mark

Khagendra Thapamagar may not get to claim the shortest man title just yet ... in an item titled Short Changed on today's early morning news (not sure which one, I was channel surfing three lots at the time), it was suggested that he will have to wait until he is 18 to claim the title of the shortest man in the world. Does this mean there is no "shortest teenager" category? (Hope he doesn't develop any sort of complex about all this!)