"I knew at a very young age, hid it for years, got worse fast and WHAM" kind of fits me. "I knew at a young age, a slow but steady increase until today" actually fits better, but I had already voted.
In hindsight, I see that the dysphoria was there when I was young, in ways that I can identify now. But at the time, I thought it was normal, just the way life was. I gradually became aware that I was different in my teen years, but could have told you what the difference was until my 30s. Even once I had an idea what it was about, I tried to keep the lid on it until I was 60, mosthly through denial.
It wasn't so much that it got worse fast, but more like it reached a tipping point with me. I never got suicidal. Kind of like a pressure cooker that is on too high, except I managed to release the pressure before it blew.
Congrats on the HRT!!