The cycle of sperm from production to maturity is about 3 months. Sperm will gradually age and die if it is not excreted. Men produce tens of millions of sperm every day, and there are new mature sperm and dying sperm all the time (under normal circumstances), so there is no time when sperm quality is the best (sudden environmental changes in a certain period of time may affect sperm quality, such as high temperature).
Poor sperm quality is the result of long-term factors such as environment and diet. Zinc and selenium are closely related to the development and maturation of sperm, so eating zinc-supplemented foods such as oysters, oysters and animal liver is beneficial to improve sperm quality.