I'm a senior grandma too, had my surgery a year and a half ago. Yes, it does take us longer to recuperate, but the surgery is worth it! Plan on eating little meals of fairly soft stuff for a couple of months, not just the weeks the kids do. Small meals every couple of hours is my way of life now. It's just more comfortable. I don't want to stretch what's left of my stomach back out and go back to overeating anyway!
Any food intolerances you had before are still there. I'm lactose intolerant, getting intolerant to wheat too. It's not unusual at our ages.