I become a little embarrassed when someone asks me when I started to transition into the transgender woman I am today. I just can't say I don't remember.
I feel as if there are several answers which are too complex for the great majority of those who asked to follow. After all, they weren't looking for an answer in a book length format. Even still the whole idea is something I should be able to explain in a simple blog post. Without having the person's eyes cloud over in boredom as I explain.
Perhaps the easiest answer is I started to transition when I was born. However, since I didn't really know what the problem was, did being born really count. The excuse is also to blame my Mom or her doctor for putting her on the meds which were so popular in the late 1940's into the early 1950's which (I think) flooded the womb with estrogen to prevent mis-carriages. Since my Mom had suffered several, the meds were prescribed. The drug was called "DES" and was a form of synthetic estrogen prescribed between 1940 and 1971 according to Google. The double edged sword of course was I may have not been born at all without the drug. I will take being transgender instead.
From birth until I was approximately 12 years old, I went through a phase of life I call "trans-interrupted" During that time I saw no way out of being a boy and indulged in all boy things such as sports and exploring the nearby woods to our house.
So, I could say I started to transition when I noticed I still could fit into and try on some of my Mom's clothes as I entered puberty. I like to say those adventures into femininity started me on a half century trip into cross dressing. It wasn't until much later I finally figured out all that time I was actually cross dressing...as a man. It took awhile to transition myself away from it because I was so good at it and had established quite a bit of male privilege.
Then again, I could say I began to transition the night I sat all alone and decided I couldn't take all the ripping and tearing I was experiencing in myself any longer. All coming because of my developing gender dysphoria. The whole process led me to be extremely depressed all the way to attempted "self harm" as my therapist calls my suicide attempts. Finally I decided to follow the feelings I was having when I was exploring the world as my feminine self. In other words, I felt so natural. I finally got it through my thick noggin to do what was best for me. No matter how selfish it may seem to others in the world, I had to save me.
Lately, I have been taking the easy way out when someone asks me when I started to gender transition. I reply by saying I do remember. It was eleven years ago when I was 61 and decided to seek out whatever help I could find to begin hormone replacement therapy (HRT). The process was a way of telling myself there was no turning back as my life was changing for the better. Plus it's a simple way (I think) of explaining to others where I am in my life. It helps me also to have my rusty memory working overtime to clear out the cobwebs.