very hard to say an exact date, all my life I knew I was not like other boys, growing up on a remote island in the north pacific with a retire marine corp father I cant say that I knew what gender identity was unril much later in my life. I do know that after my daughter left home that my dysphoria / anxiety /drug abuse took over my life. it took a decade of therapy for me to understand and accept me, so for me really I pushed later in button, because I just thought I was gay for most of my life. I never tried to understand any of this until I choose to not live any longer as the other person I was.. anyway long story maybe another post..tehe..for now I am post 40 when I knew "times they are a changing"