So..how has the Uchiha clan spread out? Who is the first Uchiha? If it's the eldest son then...that..is weird because....its only been twenty years since the war then how long has it between the sage dying and his son's fight? If it's only been twenty years all together then..how....has the eldest had children that had children that created an entire clan of Uchiha?

EDIT: I understand now. I had to really read over the Introduction again. So...if i may ask...how many years has it been in total since the Sage's death?