I was 56 when I had RYGB, but I had an open procedure, like major surgery. Laparoscopic & less invasive techniques were not available 14 years ago. So I was in the hospital 3 days, then in bed at home building strength for a few more days.
It is a really good idea to have your post-op diet in writing, with lists of foods high in protein and nutritional content, as well as supplements and fluid requirements.
Often discussed here is fluid intake. Generally, people want to believe if it's wet, you can consider it eligible to count as fluids. But I disagree. Sure, it's part of fluid intake, but you're cheating your success if you don't take in 8 servings of plain water. Water has a very specific effect on weight loss when combined with a bariatric food plan. Water will accelerate your metabolism, for lack of better terminology.
If you're one of us and you know dieting will never work and surgery is your only option, prepare for it and especially, work on positive thinking and affirmations.
It took me 14 months to drop 115 pounds, and I had a long stall, but I changed my life, started hiking the wilderness and working out at the YMCA, and eventually, I started eating any food I wanted to, sanely and sensibly. This has worked for me for 14 years, but it might not work for everyone.
I think it's important to create a list of foods that work for you. I don't like artificial sweeteners, so I use sugar if I feel like it. I have no comorbidities, so sugar has no negative effects. But I'm one of the lucky ones who can use sugar without going overboard or having any ill effects.
We can offer our own experience you, but it's important for you to explore what works for you. I recommend using a blank journal to track foods, keep your own physical records and make notes. It's hard to keep everything in your memory, but you can refer to a journal any time. And you're definitely worth the effort.