This is an old thread, but I'll throw in my 2 cents worth, anyway.
I will be 40 in January and I lost 155 lbs, my skin is a little loose on my tummy and when my butt disappeared, it left the empty skin behind, but I don't really need plastics. I wouldn't turn them down if someone offered to pay, but I don't have skin that hangs down, really. It's loose and a little crepe papery on my tummy, but not TOO bad. Clothing covers it for sure. I don't have to wear body shapers of any sort.
I have a friend, though, that lost about the same amount of weight (maybe 20 lbs more?) and she's MUCH younger than I am (28) and she has horrible hanging skin issues.
*shrug* I don't think there is any magic potion. Once you grow extra skin to cover your large body, you can't "ungrow" it. You CAN, however, moisturize daily, stay VERY hydrated, take your vitamins, eat well and workout (muscle helps to fill out some of the looseness). I plan to try body wraps, but I don't actually expect them to do anything other than make me feel good. =]