Shang didn't know what he should think of his assigned Grade.
On one hand, he was technically 23 years old by now. He had spent 22 years on Earth and one year here.
The older one got, the less age mattered. In a way, 20-year-olds were seen as young adults. They were mostly able to live on their own and take care of themselves, and their minds had matured to a significant degree.
Because of that, Shang wouldn't have felt awkward or out of place in a Grade filled with people in their early twenties. The age difference didn't matter much.
However, 18 and 20 were quite a difference. 18-year-olds were showing signs of maturity. One of these obvious signs was the lower frequency of bullying in colleges. High school was far worse in that sense.
But that age was still a big dividing line of maturity. Probably half of the class would consist of teenagers while the other half would be young adults, personality-wise.
