You were injured EVERY time you lifted without stretching? Sorry to be blunt, but I don't believe you. You were injured when you were younger and didn't stretch. That's two veriables, not one. If you actually injured yourself as often as you say you did when you were young and perhaps lifting weights without the necessary care, in addition to stretching, you probably also paid stricter attention to your form.
I lift weights with zero stretching. And the vast majority of people who've attended the gyms that I've gone to don't stretch.
https://bjsm.bmj.com/content/34/5/324
No, I mean that within a few weeks of starting without stretching I'd get injured.
Form is definitely part of it, but I went through a few cycles of "start going to the gym, do sessions without stretching, get injured, take time off".
Stretching has increased the time between injuries. And moreover, when injuries have occurred after stretching it has been very obvious why the injury occurred (bad form or too-high weights) whereas before it felt like form was fine, weight was fine, but injury occurred anyway.
I lift weights with zero stretching. And the vast majority of people who've attended the gyms that I've gone to don't stretch. https://bjsm.bmj.com/content/34/5/324