Is saggy/extra skin inevitable?

I'm getting ready to lose a chunk of weight, about 50-65 lbs (notice the
positive attitude)--will likely ease into Atkins after establishing an
exercise routine over 2-3 weeks and slowly weeding out sweets to make
induction easier (this worked for me in the past--but I fell off the
exercise wagon a year later and gained back 15 lbs). Anyway, one thing
that scares me is losing the weight and then having excess skin which
will not go away. Am I wrong that not everyone will be left with huge
flaps--I know some people who have lost 50, 60, 70 lbs and didn't have
excess flaps (or so they say). So can it be avoided??? I realize
some/most of it has to do with skin elasticity, but come on folks, any
of you "big losers" out there who didn't have to follow-up with cosmetic
surgery to remove the skin?? I don't have a problem with cosmetic
surgery and might have the boobs lifted if they are too saggy
afterwards, but I just dread the other.

Will post stats when I actually start....in about 2 weeks.

jumbles