Isn't She the Heroine of the Book?
"How do you know that chickens of what age have nutritional value?" Ke Zeming continued his questioning without showing any emotional change.
Su Yijia rolled her eyes at him without hiding her irritation. "I bet you've never cared about anything in the kitchen at home, have you? Ask any female comrade who deals with the kitchen every day, and they all know that although hens can lay eggs in the first year, the peak period for egg production is usually in the second or third year. Not only do they lay more eggs during this time, but the eggs are also larger, indicating that the hens are at their healthiest. However, after three years, starting from the fourth year, the size of the eggs laid by hens starts to decrease each year, and the egg production declines until they stop laying altogether."
This explanation left Ke Zeming slightly embarrassed. His family background was quite good, so he had indeed never set foot in the kitchen and didn't know these common knowledge facts.