I'm probably the wrong person to be answering this but I'll tellyou what I know.
They don't know yet the long term effects of tummy tucks.
Also, any operation has a great deal of risk to it. A girl recently had a tummy tuck and died because blood leaked into her lungs and she drown in it.
If it were me and i was seriously considering it, I would research the effects as much as possible. Plus all the complications. If you're going to ask a doctor about it make sure it's not a doctor who will profit from the operation. Most of those are only concerned about money.
To lose weight you should really only diet and exercise. It has the best effects at any age and you'll look great. A lot of the people who have liposuction and tummy tucks usually look sickly and gross afterward.