Numerous falls and no injuries

I'm starting to wonder if I am made of rubber or something else. In the past 5 weeks it has gotten really odd as I got rear ended 4 weeks ago at over 75mph and my car was pushed in a good 5 feet into the back seat and I only sustained a daylong stiffness in my right shoulder muscle and x-rays showed nothing. Then I fell off the ladder while repairing the roof eve, and nothing injury wise. I slipped on some tree roots which were like ice near my backdoor and landed as hard and awkwardly as a person can on the pavers, and 6 days later still no pain or stiffness. And when running after my dog who attacked a rabbit in the backyard, I stepped into a hole and know I should have twisted the holy hell out of my ankle, but no pain or tightness.. Yet I look at my brother who is 10 months younger than me and he gets injured so dang easily. Don't get me wrong, I am very grateful I am not hurting or anything, but is there an actual condition that can explain why some people simply are not injury prone? I do consume a TON of calcium if that helps.