Your body enters into the late reproductive stage when it begins phasing out reproduction around age 35- 40. It may be harder to get pregnant at this stage of life. You may also experience an early or “premature” perimenopause at this time.
1.http://www.menopause.org
2. Melmed et al.Williams Textbook of Endocrinology 14 th edition.
3.Santoro_2016_Perimenopause: From Research to Practice
4. Allshouse et al._2018_Menstrual cycle hormone changes associated with reproductive aging and how they may relate to symptoms
5. Minkin_2019_Hormones, Lifestyle, and Optimizing Aging