I'm 43 - and have lost close to 200 lbs over the past 2 years... (with about 30 -40 or so to go)
I won't lie and say there's no sagging at all but since I don't walk around naked... it's not noticable...
Upright and walking around -you don't see the saggage - when I'm doing certain exercises (like girlie pushups, or planks, or some yoga stretches, while wearing shorts -then I see it) floating in the tub it's also noticable -it's like my skin is a size or three too big.
Is it bad? no
Is it gross? to me -yeah but I think i'm ugly no matter what...
Will it stop me from losing the rest? Hell no... I have scars all over my body -it's part of m y past, and it's made me what I am...
Losing weight slowly helps prevent some of it.... and hydration and moisturizing helps out as well... strength training (which you should be doing anyhow to ward off osteoporosis - also goes a long way... muscles and you wont' get all beefy looking, behind the skin help keep it tighter..
50lbs isn't really a lot... I don't expect you're goiong to have a problem..