All mortal race's that are not Elf's or Goblin's are by default one of the younger race's. This people have few things in common beside's the fact that they live shorter lifespans then the elder's. Some would also argue that all younger race's are different form of humans. This theory stems from the fact that men can have children whit all mortal race's where as troll's can not have children whit dwarf's for example. But, says some elf scholars, that would indicate that elf's also are descendant of human's.