What stage of the lifespan is positioned between childhood and adulthood?

The stage of the lifespan positioned between childhood and adulthood is adolescence. This stage is typically characterized by significant physical, emotional, and social changes as individuals transition from the dependencies of childhood into the more independent and complex dynamics of adulthood.

Adolescence encompasses a variety of developmental milestones, including puberty, the development of more sophisticated cognitive skills, and the exploration of identity and personal values. During this period, individuals often seek greater autonomy and may experience various challenges related to peer relationships, self-esteem, and decision-making, making it a critical time for personal development.

In contrast, infancy refers to the earliest stage of life, while middle childhood pertains to the phase following early childhood but before adolescence, focusing on growth and social skills. Senior adulthood generally refers to the later stages of life, which is not relevant to the transition between childhood and adulthood. Therefore, adolescence is the correct choice as it specifically signifies the intermediary phase between these two distinct stages of development.