One is in nomadic, hunter-gather societies that often shift camp and that are physically incapable of transporting old people who can't walk when the able-bodied younger people already have to carry their young children and all their physical possessions.
koczowniczych, łowiecko-zbierackich, które często migruje, gdzie fizycznie niemożliwe jest przenoszenie niedołężnych starców, bo zdrowi muszą nieść małe dzieci i dobytek.