Final answer:
Adler maintains that our style of life is not set until middle age, allowing for personal development and changes in lifestyle and goals.
Step-by-step explanation:
In Adler's theory, he believed that our style of life is not set until middle age. This means that our way of thinking, behaving, and making choices is not fixed or predetermined until we reach middle adulthood, which typically starts in the mid-30s and lasts until the mid-60s. During this stage, individuals may still undergo personal development and make changes to their lifestyle and goals.