In Russia we have an old adage " Бабий век - 40 лет" (translation: woman's century - 40 years) which is related to childbearing years and menopause. Last time I heard about this topic was maybe in my teens and it was about women "expire" at 30. But recently the age got lowered to 25 and even lower. It's only late teens and early 20s now, so around 6 years - thats quite a short life-span?

Edit: I feel like I asked sub of ppl who dislike women Edit2: this thread is a mess and only made some women get harmful thoughts about themselves