Someone asked about long-term complications in the elderly who had surgery decades ago. You can't really compare, because weight loss surgeries back in the 60s and 70s were very different than they are today. They were very risky and some people (including a former co-worker of mine) had them reversed - and some people died from them. But again, there's no comparison to the surgeries they do today. Plus the ones they do now are much safer and much less likely to have severe complications.
you should be fine as long as you follow your plan, keep on top of your supplements, and have regular blood work done to check for deficiencies. Most deficiencies can be reversed if they're caught early. I do have osteoporosis, but I have no idea if that's due to my weight loss surgery or not, since we didn't do a baseline before my surgery. But I'm also in my 60s and osteoporosis runs rampant on both sides of my family, so it could have been that as well. I'm on a drug now that maintains bone, though - and there are other drugs that actually build bone.
Honestly, at my starting weight (almost 400 lbs), I was much more concerned about complications from being severely obese (like premature death, for one) than I was about complications from my RNY.