At 34 I think it's more important to make sure your diet is balanced and that you're exercising before taking any supplements.  Case in point, I had a nagging pain in my 40 year old knee.  Once I got serious with exercising, walking and stair climbing, the pain went away and it has stayed away.  If you're confident your diet and exercise are where they should be, then go to supplements.  I'm sorry, I can't be much help there, except I have heard that glucosamine is good for healthy joints.