Particularly interesting is that when they split the dataset by sex, the transitions were present and at a similar magnitude in both sexes. We make much in western culture of the (peri-)menopausal change in women. I read this as an indicator that at least significant parts of the transition in this age range for men - acknowledged for a long time now - are just as big as menopause.
I don't remember noticing that the last time this study came around, but then again, I am in my mid 40s. :)
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