Almost 200 lost but still need to lose another 100.

Hi! I'm a 66 year old granny and have been dieting most of my life. Recently I have lost 195 lbs. But I still need to lose 100 to be at the weight the charts say I should weigh. I really don't care about how I look anymore at my age which is a good thing as I have loads of excess skin on my arms and legs. I just can't afford to have it surgically removed. My problem is my knees are worn out from carrying around all this extra weight all my life. My orthopedic says I have to lose at least 50 more pounds before I would be able to get knee replacement surgery. It is so very hard to exercise enough to lose the weight even with a good diet. But I know this is something I can and will do as I refuse to give up. It really hurts to walk but I will not use a wheelchair as long as I can help it. Yes it is a slow process but I am winning the battle. I wish everyone the best of luck and success in there journey to better health.