It tightens up better the younger you are, and depends on how big you got, and how long you were that big.
I know the last time I dropped some weight, about 10 years ago, it tightened back up pretty well (I was around 50).
This time, though, it’s a bit different. I gained to a higher weight, and I am now about 20 pounds below my low point of that prior loss, plus I’m over 60.
I am definitely seeing some deflated and sagging skin in places I don’t really want to see it (particularly the sides of the chest). Hopefully it will tighten up some over time, but if not, well, I’ll just have to live with it unless I want to spend thousands on plastic surgery.
I do occasional fasting so maybe autophagy will help some.