What is the life expectancy after such invasive surgeries in the long run?

Had a Lap-Band in 2010. Didn't help at all, was sick most of the time, until some time ago when I had all the liquid taken out of the band as it was slipping.I'll eventually need a revision surgery-currently weighting 200 pounds, 1.71 height, I'm 35, and I don't know how life will be 20, 30, 40 years from now on, with half stomach/changed internal anatomy. Thank you in advance for your professional opinion.

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