Benchmarking hormonal biomarkers like cortisol and the estrogen-progesterone balance is most helpful in a woman's 20s or 30s.

“generally I find that benchmarking is best performed in your 20s or 30s are periods not that regular in terms of duration of the menstrual cycle when the menstrual cycle first sets in it depends so I was like clockwork every 28 days until I had my hysterectomy in August same thing with my daughters”