The question regarding the expiration date on fall arrest equipment has more to do with the stitching then the belts themselves. Insect repellent, tick repellent and UV sunlight will break down nylon stitching. Inspect your gear the night before. In the case of a fall your body weight is magnifyed many times depending on how far you travel before coming to the end of your rope. Have a plan on how you will climb back to your platform or climb down the tree. You cannot hang suspended for any amount of time, suspension trauma will kill you as fast as the fall itself. With a lot of us being past the 40 and 50 yard mark in life, backyard practice with some friends will reveal that we don't bend and move as well as we did 25 years ago. As always,safety first.