Have I Reached my Ideal Weight at 140lbs?

I lost the weight I wanted to loose which is 50 lbs. I'm 5'2" and 58 years old. I now weight 140lbs. How do you know what your ideal weight is when you now have all this loose skin?

If I had a Tummy Tuck, which is not going to happen, I am sure I would weight at least 20 lbs. less. What should I weigh?

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