Why do pests live more on old, sick pine trees?

1) A lot of tar is released on young trees,
2) tar contains turpentine that repels pests.
3) Old trees are a more convenient refuge.

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.