Language changes all the time. A word that means one thing at one time may eventually come to mean another thing. E.g. nice, whose original meaning survives in the phrase 'a nice distinction' but otherwise is a very different word.
However, we don't usually lose essential words, words we learn very early in life and use frequently. Woman, man, boy, girl, female, male are such words. They refer to the biological reality that homo sapiens is a sexually dimorphic species, just like all the other mammals. Recognising and living with this reality is not the same thing as accepting the limitations imposed by sexual stereotyping.
@Needmoresleep, I am no sort of scientist, but from the little I know about genetics, it is indeed fascinating. You'd hope, though, that if push comes to shove, senior medics, vets and other HCPs and all biologists would accept that every single human being alive on the planet now and throughout history started life in the womb of a woman who then gave them birth.
We need a word for the class of humans whose bodies develop very soon after conception to provide the large gamete and to be capable of gestation, birth and breastfeeding. We have one. It's female. Adult human females are women, juvenile human females are girls.
We need another word for the other class of humans whose bodies develop very soon after conception to produce and supply the small gamete. We have one. It's male. Adult human males are men, juvenile human males are boys.
We will always need these words. Changing their meaning as some people are trying to do means we can't communicate clearly and precisely. In healthcare, that leads to potentially lifethreatening consequences.
eu.usatoday.com/story/news/health/2019/05/16/pregnant-transgender-man-births-stillborn-baby-hospital-missed-labor-signs/3692201002/