Well....I'm 5' 3" and 25 years ago I weighed 112 lbs BUT...that was 25 years ago and this is now. I was a teenager then who was not yet fully grown and developed nor had I been through 3 pregnancies. My goal now is 140 pounds with which I think my doctor would be thrilled when I get there. Will I ever look like that teenage girl again? Not likely, but hey...I'm not a teenage girl anymore. I'm a forty-something woman approaching perimenopause.
My point is that very few people can turn back the clock and look like they did 20 or 30 years ago no matter how much weight they lose; bodies change as we age and it may be a very unrealistic goal to try and get to where you were then, that's why those infamous height/weight charts also take into consideration age as well as height.