Final answer:
The term for the stage of development between the ages 18 to 29 is 'emerging adulthood.' It is distinct from 'adolescence' and precedes 'middle adulthood' and 'elderhood'.
Step-by-step explanation:
The term used for the stage of development called transitional adulthood, which occurs between the ages of 18 and 29, is emerging adulthood. This developmental phase is characterized by various changes and explorations as individuals transition from adolescence into full-fledged adulthood. Emerging adulthood is a period of life when individuals explore their personal and professional ambitions, which may include higher education, starting a career, or forming serious relationships.
Adolescence, on the other hand, typically refers to the period from puberty to the teen years, where there is significant physical, cognitive, and social development. Middle adulthood begins in the mid-30s and extends to the mid-60s, encompassing career growth, family life, and the onset of aging. Elderhood is not as commonly used a term but refers to the latter part of life, often considered to begin after middle adulthood, where individuals focus more on retirement and coping with age-related changes.