biological theories of aging

Students are required to post a minimum of three times per week (1 main post answering the question 100% before Wednesday at 11:59 PM EST and 2 peer responses by Sunday at 11:59 PM EST). The three posts in each individual discussion must be on separate days (same day postings / replies will not be accepted).

Chapter 3 – Biological Theories of Aging & Age Related Physical Changes. 

Chapter 4 – Psychosocial, Spiritual, and Cognitive Aspects of Aging.

Question(s):

1. Select at least 3 biological theories of aging from your textbook.

2. Explain / discuss each one (at least 3 biological theories)

Guidelines:  The answer should be based on the knowledge obtained from reading the book, no just your opinion. All the theories (corresponding chapter in textbook) should be mentioned and explained (mention at least three). Your grade will be an average of all theories.