text: I figured out I wasn't cis in May 2017, and then started testosterone in March of 2019. So I spent a solid 2 years with living as a guy (although not always passable). I started t 2 months before my 16th birthday and I'm happier then I ever have been in my life. I think if someone has known for a few years and is fairly certain they are trans 14 is the bare minimum that someone should be allowed on cross sex hormones. 13 is definitely too young, 14 is still iffy but I can see a 14 year old on hormones.