I'm assuming you have the "paratrooper knees" as well...

I'd hear people complain about their knees hurting- I was just like "duh... knees hurt... that's what they do" because for my entire adult life they hurt. Around 10 years ago they started grinding- I don't know if they hurt much of any more, but the grinding made me feel like my bones were directly rubbing on each other- and it's a scary feeling. That's what you get for carrying your body weight on your back.

I was 129 when I ETSd. Here's a pic of me getting jumpmastered with a 153 pound ruck. I could only stand upright for a few seconds at a time and I pretty much had to be shoved out the door.