@Flomper, a few women’s anecdotal experience does not constitute a scientific population.
Your anecdotal story isn’t science, just what happened to you. You cannot prove or disprove a theory on your own personal story... it has nothing to do with personal stories in isolation.
Scientific evidence points to changes in menstrual cycles changes, and hormone levels decline, and aging of eggs after age 36. That’s the perimenopause.
I’m delighted you had healthy full term pregnancies after the age of 36 with healthy outcomes. The rate of birth defects rises sharply in late thirties, so I guess you were one of the lucky ones.
Science is factual, whether you had that exact experience or not is immaterial and doesn’t indicate anything.
Large populations are assessed in trials in order for the results to be statistically significant - the last paper I read on gynecology had a population of 19,500 women, which may or may not have included the 100 you claim to personally know.
Anyhoos, enough about scientific facts, and back to our opinions about the ill fitting dress!