Think a lot of it's due to age, speed of weight loss, and how elastic your skin is as an individual anyway! You're young and doing SW which should bring a slower loss than some other plans - good omens for your skin not going saggy!!
I lost four stone, but over a period of about eight years and my skin was o.k. I want to lose another 4st but rather more quickly, so am hoping even if it goes saggy, it will firm up after a while. I'm 72 (but feel 19 most of the time) so.....
I've lost just over 5 stone hun (between beginning of last may and this january really), so in just over 8 months. I'm not finding my skin going saggy at all, and I'm 26 xx
I am 32 - and have lost over 5 stone. I do quite a bit of exercise and just have a wobbly tummy and bingo wings. I think everyone has wobbly bits though!?