I never lost the visual plasticity of childhood. In order to get the correct prescription I have to have my eyes dilated & paralyzed. Without that I’ve got a 2-3 diopter variance. It always cracks my eye doctors up, because, yep... should have lost that ability 20 years ago!
Ditto, I can still hear like a bat. I’ve lost some of my hearing, because I was tested at 17 in the military (at which point they tried to poach me into being a sonar operator :p Nope! Not sitting in a dark room listening to static for the next 4 years, pass!) so even though my hearing freaks out docs now, I’ve lost roughly about 1/3 of my range. But I can still hear the “mosquito” ring tones no one over 20 is supposed to, as well as a lot of subsonic whines & growls (makes my mastoid bone hurt). If that gives you any idea of how good my hearing used to be.
Whether that flexibility has stayed because of trauma, or just genetics, I don’t know.
My trauma history didn’t start until I was 17, but that’s still young enough to make it plausible.