Get a dermaroller and some good skin firming cream! And I dont want to be the pessimistic one in this situation, but losing weight from the lapband is most likely going to give you saggy skin regardless of your age. Your age will more or so have to do with how well your skin will snap back, but that could be over a couple years.
The best thing you can do is to be preventive. Saggy skin is not inevitable. You can dry brush your skin to get rid of dead skin cells and improve circulation, you can use a dermaroller which improves skin regeneration and your skin's collagen supply.
But yeah, there are tons of skin products you can try. Just focus on skin rejuvenation and elasticity.