Your concerns are much like mine.....but I do think the benefits out way the fact that we have to give up the 'amount' of food more so than the 'type' of food we will eat for the rest of our lives. As to your concern about aging...I am a hairstylist so I come across a LOT of people. I was discussing my decision to have WLS with her. She asked what it would entail, so I described how they remove a good portion of you stomach permanently. She then informed me that her mother, way back in the day, always had stomach ulcers. Back in the day when that happened doctors removed 80% of her stomach. So technically she had a similar procedure done. She lived a very healthy life and just passed away at the age of 88. I hope this story helps a little with your concern of aging.
Good luck your decisions!