Bonjour Mme C.!
I'm certainly no expert at all this, but I wanted to echo some of the sentiments and comments shared above. When you think about it, 60 lbs is a good chunk of weight off of your body, and will alleviate some of the burden on your joints, hips, etc. Sometimes, in our desire to lose a lot of weight, we forget just how beneficial it is to lose even just 5 lbs. Ultimately, the decision will be yours to make. Personally, if my doctor would have told me, "you will lose approximately 60 lbs", I would still have underwent the surgery. I'm almost at 25 lbs lost right now, and I'm already feeling better. My plantar fasciitis is no longer acting up, so that pain went away....
I wish you best of luck, whatever your decision may be. ♥