My knees randomly pop and crack sometimes, it happenes everyday now and they hurt. What's the problem?

Well... I really don't know what is going on but you should probably see a doctor before it gets even worse. I hope you are okay. ;)

my knees sometime do that as-well. when i turn to fast or even just standing up they pop. what it could be is you have tight muscle in your legs, for me it's my quads (the font). what is happening is the are pulling on my knee and thats whats making them hurt. that popping could be because of the tightness and it moves my knee. what i recommend is going to a doctor, or going to see a personal trainer. i have one and she has helped me tremendously! she works with me on balancing my leg muscles and she stretches it out. a benefit of a personal trainer is that you can get healthy and strong.

a doctor might b able to help by stretching it and giving you medication, but i really don't recommend it. the only reason i am is because personal training can be a bit expensive.

also, do you have knock knees? do they go inward at the knees then out ward?- that's what i have.

check out these exercises if you want --> http://www.livestrong.com/article/202397-knock-kne...

You're getting old.