Whatever acceptance for non-binary identities exists in society (and it is very limited as it is) is closely tied to the idea of youth being allowed to experiment a bit as long as that experiment is temporary. So

take care of your older nonbinary folks. Take care of your nonbinary folks slipping out of ‘young adulthood’. Take care of them when their hair turns thin or grey or their age starts to show in other ways. Violence is coming their way. A lot of the world is telling them that their existence is an unacceptable form of immaturity.