Why are some ancient peoples deaths and births unknown?

Some ancient peoples' deaths and births are unknown due to a lack of written records, which often resulted from the absence of a formalized system of documentation or literacy in certain cultures. Additionally, many records may have been lost or destroyed over time due to natural disasters, wars, or the decay of materials. Moreover, societal focus on monumental figures or events often overshadowed individual lives, leading to a scarcity of detailed personal histories for the average person.