I started at 46 (which was last year) - surprised to find that the forties are the smallest age cohort in this poll. Here I'd been thinking the forties were the most common age to begin it.
How I envy you youngsters who have so much more self-awareness, information, support, and resources than were available when I was young. I remember wishing in my early twenties that I could transition - and telling myself it was impossible, never gonna happen, just forget about it. <sigh> The lies we tell ourselves out of fear and ignorance.