Baidu Encyclopedia defines puberty as a period when girls' sexual functions gradually mature from 11 to 12 years old to 17 to 18 years old, and boys from 13 to 14 years old to 18 to 20 years old.
There are four basic explanations for youth: the magnificent youth of youth; it is also used as a metaphor for the restoration of youth in a century-old factory; it refers to the age of teenagers and young people; in spring, the vegetation is lush and green, so spring is called youth. The youth we often talk about refers to that specific, beautiful and precious young age of twenty.
The timeline of this article is the written record of the ten years from Lin Jingyue's entry into junior high school at the age of 11 to her graduation from college at the age of 21, from adolescence to youth.
PS: This article is written for myself, but if anyone can find resonance in it, that is my success.