Although I'm only early stages, I'm getting ready to transition.
I could have done this at 22 / 23 except I was too transient and not really settled enough. Nor Mature or financial.
At 25 I begun a relationship that finished sadly a few months back with passing of my partner of nine years. I told her from the very beginning that how I saw myself and it churned in my head all these years.
Now at 35, it is now or never. I am more financial, Mature, knowledgeable, have a place that I can call my own.
I see transition taking 5 years for me. That's only a ball park figure but hope to start HRT in the next year, starting to come out of the closet now, just have to be more settled with jobwise, after all, a girl has to work.
I don't think it really matters when we transition, there are no right or no wrong answers