Which generation gap are you in since birth? Only 3 types of ancestors living in each generation gap within the food chain. Asexual having both gender reproductive organs, male, female. Homo sapiens are either male or female since conceived transforming from a fertilized cell to infant at birth toddler, adolescent, puberty, able to reproduce or becomes extinct DNA in future generation gaps of compounding DNA lineages so far. never duplicate in any other generation gap but the one arrived in so far as population never same ancestors again.
Why specific lifetimes are self evidently here.