The first thing hitting the concrete when falling is your palms, so having a glove with plastic protection will help not losing any skin from your palms.
Also wear a helmet.
Also wear a helmet.
It's been over 20 years since I was on rollerblades and I don't even know if I'd have the balance anymore, but I wouldn't do it without at least one knee guard and both hard wrist guards.
Yes, if you're young and have good reflexes, you can break your wrists. If you're old with slower reflexes, you can't get your arms out in time so you break your hip instead.