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How does the human body knows that it's time for a event that happens around a certain age like puberty or something that's periodic like menstruation or gestation time of 9 months?

Please note I'm NOT talking about day-night biological clock .

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closed as too broad by anongoodnurse, another 'Homo sapien', AliceD, WYSIWYG Feb 20 '17 at 12:57

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ It's not clear what do you mean by 'how does the body know'. $\endgroup$ – Tyto alba Feb 14 '17 at 15:51
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    $\begingroup$ this is still a very active are of study, the field is called chronobiology. Epigenetic clocks which may be longest, there are several Horvaths being the most famous and is based on the DNA methylation. I don't know the details of how it functions however. $\endgroup$ – John Feb 14 '17 at 16:04
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    $\begingroup$ This is an interesting question, but as written now is broad and shows none of your own research. If you can edit to narrow down (e.g. only menstruation) and include some of your own research (what you found when reading about it), I'd happily remove my close vote and take a stab at the answer. Thanks! $\endgroup$ – anongoodnurse Feb 14 '17 at 16:22
  • $\begingroup$ @SanjuktaGhosh it's quite clear that it means how does human body triggers certain functions at certain age or period $\endgroup$ – user1062760 Feb 15 '17 at 8:26
  • $\begingroup$ @anongoodnurse I did search but nearly all result ended up on biological clock that regulates sleep. And that's not what I am searching for so I ended up posting a targeted question on SE $\endgroup$ – user1062760 Feb 15 '17 at 8:28
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It doesn't always. Some people have an undistorted slown down aging. Jyoti Amge is over 18 and looks like an undistorted little girl. Yesterday, I saw a TV show that showed a 22 year old who looked like an undistorted 8 year old girl. There are also people who have distorted aging. People with progeria look like a distorted older person. I think nodoby has an undistorted sped up aging. Gabby Williams looked like a distorted toddler when she was 12. Nicky freeman from https://thewest.com.au/news/australia/forty-year-old-trapped-in-childs-body-ng-ya-220462 has a distorted bone structure of a ten year old boy and is all wrinkly. The girl in the YouTube video at https://www.youtube.com/watch?v=xoBetcKAxII&t=96s has the undistorted bond structure of a 13 year old girl and is all wrinkly.

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