I lost around 75 lbs and I have loose skin on my stomach, inner thighs and right under my arms. I much much much prefer having a little loose skin to being 75 lbs heavier. I look totally cute in clothes
On me, the loose skin only looks really really bad when I lean forward, then the stomach does look wrinkly and deflated. But hey, I'm 37 years old and I lost a lot of weight. This is my body, I was heavy and I lost weight, I accept it.
There is no way to tell if someone will have loose skin or not. It varies by age, elasticity of skin, amount of weight lost, time overweight, etc etc. Skin brushing, water drinking, exercise - in my opinion, can't make skin spring back (although there may be other very beneficial, worthwhile effects!).
Good luck to you!