In the absence of suspected endocrine dysfunction, baseline hormone levels should be established in late teens, mid-20s, and at age 30.

“And I'm a very strong believer in people getting an insight-- that is, a window-- into their hormonal composition, not just when they encounter problems but starting at a pretty early age, even if it's only done once every five years or so, having a reference point to your 20s and to your 30s and mid-30s for when you felt a certain way.”

“in your 20s that's when you want to do some base casing with estrogen progesterone and testosterone”

“in your 30s having a base case I think is really essential”

“I recommend getting your hormone levels checked once if you can, if you're still in your teens, in your late teens, after you've gone through puberty to establish a sort of baseline. Most people won't do that because it's too late. I didn't do that. Once in your mid-20s. Again, we're talking about no suspected or apparent endocrine dysfunction in your mid-20s. You have a baseline. Something to compare to when you were in your say 18 to 20 and again, when you're 25. That would be ideal. And then again, I would say when you're 30.”

“So I would say getting your hormone levels checked once a year after age 40, and prior to that, once every three to five years starting at about age 18 would be ideal.”

“And then start once a year starting when you are 40 or older.”