Hi... hate to tell you this, but it sounds likely to me that you will since you got them in puberty. I have the old faded marks you described from when I filled out on my hips and butt when I was a young teen. I'm 22 now and just had my first baby 3 weeks ago. First of, all, I'm a Mary Kay beauty consultant, and have access to great products. I'm also incrediby vain about my skin. It was in tip top condition when I got pregnant. Let me tell you, I used everything under the sun, drank tons of water, and tried to keep my weight gain down. The only stretch marks I had until 7 months were on my breasts. But around 8 months, they exploded, all over me, and no preventative measures I tried seemed to do any good. And it wasn't just excess weight gain, because I was all baby. The bad news seems to be that the firmer and more conditioned your skin is, the worse your stretch marks will be, because it's never been saggy, stretched, or flawed before. So when it has to do all that stretching so fast, it can be really bad. Plus, as far as weight gain goes, there isn't a whole lot you can do about mild fluid retention in pregnancy, which caused the stretch marks on my upper arms.

I wish I knew of a miracle cure.