We've been through this before crispbuttyfan
And there are on the whole really only two kinds of people who deny that the most extensively researched paraphilia exists: TRAs and AGPs. (There is of course considerable overlap between these two groups.)
I'm not going to bother listing all of these studies again, especially since facts seem to make no difference. I feel that you are maybe too invested in this emotionally, so I'll spare us both the repeat argument.
But your claim that "trans adults whether late transitioning or early, were both trans kids" is demonstrably untrue.
In fact a large majority of late-onset transsexuals were completely gender conforming boys, often displaying strong homophobia and chosing macho jobs. Now the cross-dressing sometimes started in adolescence and sometimes later, but that doesn't make you a transkid.
The DSM-V is very strict on what constitues gender dysphoria. And late-onset transsexuals do not have childhood GD - otherwise, obviously, they wouldn't be called late-onset.
And yes, late-onset transsexuals have a tendency to retcon GD into their childhood, but that doesn't make it true.