Final answer:
Childhood typically ends with the eruption of the first permanent molar around 6 years of age, marking a key stage in dental development during middle childhood.
Step-by-step explanation:
Childhood ends with the first eruption of your permanent teeth, specifically your first permanent molar (M1). This happens around 6 years of age in living humans. During middle childhood, deciduous teeth, also known as baby teeth, start to be replaced by permanent teeth. The emergence of the first permanent molar marks an important developmental milestone in a child's growth.
The process of deciduous teeth loosening and falling out to make way for permanent teeth generally begins with the incisors, which are lost around 6 to 8 years of age, followed by the premolars and canines. The second permanent molars typically emerge later, around 11 to 13 years old. It is worth noting that the third molars or wisdom teeth emerge much later in late adolescence or early adulthood, completing the full set of 32 permanent teeth.