Final answer:
The statement that our style of life is not set until middle age is false according to Adlerian theory, which states that the core lifestyle is established by early childhood.
Step-by-step explanation:
The statement that Adler maintains our style of life is not set until middle age is False. Alfred Adler, a well-known psychologist, introduced the concept of 'lifestyle' or 'style of life' and argued that it is essentially set by the age of four or five. This early childhood development shapes our perceptions, attitudes, and behaviors throughout life. That being said, Adler did acknowledge that people continue to develop and change throughout their lives, but the core aspects of one's lifestyle, according to Adlerian theory, are established early on.
Middle adulthood, defined as the period from the mid-30s to the mid-60s, is a significant stage characterized by achievements, such as reaching career goals and raising a family, as well as the physical manifestations of aging and an increased risk of health problems like heart disease, cancer, and diabetes. However, this does not imply that our lifestyle is not set until this period but rather signifies a stage where the lifestyle established earlier may be reflected in our achievements and health status.