Shi Tou looked somewhat lost, looking at the tree rings, feeling discontent.
Han Cheng quietly wiped the sweat from his forehead on the side.
He, as a modern person, felt inferior.
After calming down from this mood, Han Cheng began to ponder what was bothering Shi Tou.
Before the existence of a calendar, birthdates couldn't be known.
But now, the Green Sparrow Tribe already had the most basic calendar. Children born after the calendar had birthdays, knowing how many years they had lived in this world.
After pondering these, Han Cheng suddenly remembered the method used by the tribe to confirm adulthood based on height.
This method was unfair.
Human growth is not only physical but also psychological.
The adult standards in the tribe need to be adjusted, not based on height, but preferably on age.
Now that the tribe has a calendar, this can be achieved.
However, how many years old should Han Cheng be considered an adult? This makes Han Cheng somewhat embarrassed.
According to his inherent thinking, it would be best to set it at eighteen.
But that's a bit unrealistic.
Because of medical care, food, and labor methods, the lifespan of primitive humans is not long compared to that of people in later generations.
It's not that they can't live to a ripe old age, but the conditions don't allow it.
The non-natural death rate is too high, reaching over ninety percent.
It would be inappropriate if adulthood is set to eighteen at this time. The Green Sparrow Tribe is still better off. Still, for other tribes, according to this standard, probably more than half of the people would have passed away before having the chance to pass on their legacy.
Moreover, setting adulthood too late is not conducive to the growth and development of the current tribe.
First, the working time would be shortened, and second, the appearance of the next generation would be too late.
Fourteen or fifteen years old for adulthood should be more appropriate...
This is just his initial idea for now. The specific age to be considered adult still needs to be based on the actual situation of the Green Sparrow Tribe.
However, these are things that can only be implemented several years later.
After all, there are still many minors in the Green Sparrow Tribe, like Shi Tou, who were born before the calendar came out and don't know their specific birth year.
Therefore, for the Green Sparrow Tribe to determine adulthood based on height, this matter still needs to be implemented for several more years.
But before that, other things about calculating age can be figured out.
"Shi Tou, come here..."
After his idea was rejected, Han Cheng called Shi Tou, who was squatting in front of the tree stump and unwilling to leave.
Shi Tou stood up, walked to Han Cheng's side, and listened to Han Cheng's words.
At first, he was puzzled, but after listening for a while, he had some enlightenment.
Finally, he became enthusiastic.
The method Han Cheng told him about was the twelve zodiac signs.
Twelve years for one cycle, each year named after an animal.
For Han Cheng, who came from a later era, the twelve zodiac signs had a deep sense of familiarity from the bottom of his heart.
One cycle of twelve years, as long as you know the zodiac sign, you can quickly calculate the age, and it's also easy to compare who is older and who is younger...
Shi Tou, who learned the calendar from Han Cheng, quickly accepted the concept of one cycle of twelve years. After all, one year is twelve months.