I get that in the West we are generally conceiving at a later stage in life than before, and that this does not improve odds of conception. However, with fertility, just as with so many things, we are individualising the problem. Here too the focus is on age. Just get kids when you're younger! What's the big deal.

Let's set aside that there are deeper sociological reasons on why young people start with kids later in life. We are not giving enough weight to all of the pollutants that we are exposed to in society, and how they affect our bodies, health and lives.

I heard Dr. Shanna Swan talk recently about the effects of hormone disrupting chemicals on (male) infertility. It's dire stuff really.

She was on the podcast promoting a recent Netflix documentary called The Plastic Detox in which they intervene in couple's lifestyles to reduce the amount of plastics and the hormone disrupting chemicals (bisphenols, phthalates, etc) they are exposed to. I highly recommend it.

There's over 70 different hormones in the human body regulating all kinds of biological functions. Fertility is only one aspect but think about the adverse effects these chemicals might be having on body weight, our sleep cycle, blood pressure, stress, libido, etc. We are prescribed drugs for related ailments at record rates. Maybe we should take a step back and treat less and prevent more.

You’re correct. All this talk about when people choose to have kids over-intellectualizes that what is a biological function. My wife and I have three kids. I’m not sure you can say any of them resulted from a rigorous analysis. We had our first in law school as a happy surprise. We theoretically planned our second and third, a six year gap after the first. But that the timing coincided with moving from an apartment to a house. We weren’t thinking about more kids when we moved—we wanted to take advantage of good interest rates. But my wife observed later that the availability of more space for kids probably subconsciously influenced our decision to have more.

When talking about hormone disruption, I think people over-focus on how that affects the ability to have kids. But that overlooks how hormones can change behaviors and desires. I don’t see anyone rebutting the fact that testosterone levels in prime-age men have dropped by half compared to the 1960s. Yet nobody seems to be talking about that as a probable cause in the drop in fertility rates. Even if these men are technically able to have kids if they want. Is it possible that the drop in testosterone levels means that men are less interested in having kids, and perhaps less able to persuade women into doing so?

The biggest fertility distributor is probably sugar by a country mile. Being fat screws with your hormones.

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