Congratulations on the 70lb weight loss!

Regarding the loose skin. I've been told that if you're younger there is a higher chance it will just tighten up - then again, if it's a lot of skin, which I would assume it is after losing that amount of weight, then surgery may be your best bet. Another thing is if the weight has come off really quickly, like 3-4+lbs a week then the chances of the loose skin tightening up are lower