It's NEVER too early to start. Just start with little changes and do what you can. Remember that food is 1/2 the battle. I would recommend that you take fish oils to help with any inflammation. Also, you might want to try swimming and/or a water aerobics of some sort (like Aqua Zumba). Anything in the water will be good on your hips and joints in general. Also, you can exercise other parts of your body too. If you work your core muscles it will actually take some pressure off your hips and knees. If you do get soreness or pain, remember to ice and not to heat. In general though, I would discuss all this with your doctor and come up with a plan. Good luck and keep us posted!