What age of child would not understand the intentions of others?

Children typically begin to understand the intentions of others around the age of 4 or 5, as they start developing theory of mind—the ability to recognize that others have thoughts, beliefs, and desires different from their own. Before this age, particularly in toddlers (ages 2-3), children may struggle to grasp the concept that others can have different intentions or perspectives. Their understanding of social interactions and intentions is still very concrete and egocentric at this stage.