There was a ten-year gap between the battles of Crécy (1346) and Poitiers (1356) in the Hundred Years War. Over the years, the Black Death, an epidemic of the plague, has swept across Europe, claiming about a quarter of the population. As soon as the British and French came to their senses from the horror of the epidemic, the war resumed.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.