Correct me if I'm mistaken, I was under the impression a human female is born with all the egg she will ever have, so the expensive production bit you're talking about happens during gestation of the human embryo.
replyYes. Although, technically, no. In humans there is a massive change as the result of the first time air touches the lungs. It inflates the lungs. It causes the baby's immune system to engage, disconnect and start working.
replyAnd it causes the ovi to start the cell division that will create the next generation, form the "yellow body" and then effectively disconnect from the baby girl's body (obviously that cell division doesn't complete until a sperm combines with an ovi, hopefully multiple decades later)
So normally, this happens immediately after birth, together with dozens of other big changes.
Because you can reset the clock, and even sabotage it. In fact, that's how we produce a certain class of medicine (by now probably 10 classes of medicine, but ...)
replyAlso, there Henrietta Lacks, died in 1951 of metastasized adenocarcinoma, but "still alive":