I am pretty young also, 28. I had a knee injury last year and have a family history of knee problems. After much research I found these highly recomended by alot of floor guys that are on there knees all day. http://www.proknee.com/index2.html
I ordered them the begining of this year and absolutly love them. They are expensive but worth every penny. They have no pressure on your knees what so ever. Your knees allow you to do work and bring in the checks so it's worth the initial expense in my mind.
I have a set, but usually forget to wear them. I'm 59 and have never had problems with my knees (other than getting up after being on them for an hour or so). The real stinker is that without them, you can ruin a perfectly good pair of pants in about 15 minutes or less.
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