How likely would it be to have loose skin after major weight loss?

On a scale of 1-10, how likely would it be that a 24yr. old female would have flappy floppy skin left over that didn’t “snap back into place” after a 150lb. weight loss over the course of a year to a year and a half? What could this person do to ensure they didn’t get flappy floppy skin over the course of major weight loss, and that it does snap back into place?

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