 
 <translate> Reasoning: The relevant sentence in the passage is: There are no precise dates for when this cohort starts or ends; demographers and researchers typically use the early 1980s as starting birth years and the mid-1990s to early 2000s as ending birth years. <ibo> Nkwupụta: Nkebi ahịrịokwu dị mkpa na amaokwu ahụ bụ: Enweghị ụbọchị doro anya maka mgbe ìgwè a malitere ma ọ bụ kwụsị; ndị na-ede akụkọ ihe mere eme na ndị na-eme nchọpụta na-ejikarị mmalite afọ 1980 dị ka mmalite afọ ọmụmụ na etiti afọ 1990 ruo mmalite afọ 2000 dị ka afọ ọmụmụ njedebe. 