> Did old people just die randomly and then they were buried and that was that?

In most places on earth the elderly live with their children. The children care for them, then yes they die.

They’ll often be buried in the yard if they have land or in a plot designated (graveyard). Alternatively, they’ll have some sort of cremation ceremony.

Pretty much been that way forever. The last 70 years in the US has gotten exceptionally weird, looking through a historical lens. Frankly, it looks like we hate our elders.