I have no idea of the exact age that I was, but it was sometime during 2015 I think, which was when I was about 17-18. I know that when I joined these forums I was firmly identifying as aro so it was definitely at least a few months before then.
It's amazing how far I've come in those past 5 years tbh. I was so far inside my own shell back then; I barely talked online at all, and I never felt like I belonged anywhere. This forum helped me feel like I belonged for the first time in my life, and also helped me realise a lot more about myself that would have taken a lot longer for me if this forum never existed.