@Equus,
Equus wrote:
Modern Christians would say "Well, customs were different in those times- people died a lot younger and had to start earlier."
Wrong. You are repeating an error in understanding statistics.
Infant mortality rates were higher in the past which brought the
average age down. People still lived to be, 60, 70, 80 and 90 at the same rate as now.
People just don't understand how to interpret data correctly.