TIL After the 5th decade of life, there begins a noticeable reduction in body hair especially in the legs and the reason is unknown

https://fertilitypedia.org/edu/symptoms/low-facial-and-body-hair-growth#:~:text=The%20reason%20for%20this%20is,hypogonadism%20and%20XX%20male%20syndrome.

https://www.reddit.com/r/todayilearned/comments/1538j2e/til_after_the_5th_decade_of_life_there_begins_a/